So, too, Isaiah in foretelling to the Jews that they would return from Babylon to Jerusalem in safety, and would not suffer from thirst on their journey, says: "And they thirsted not when He led them through the deserts; He caused the waters to flow out of the rocks for them; He clave the rocks, and the waters gushed out." These words merely mean that the Jews, like other people, found springs in the desert, at which they quenched their thirst; for when the Jews returned to Jerusalem with the consent of Cyrus, it is admitted that no similar miracles befell them.

In this way many occurrences in the Bible are to be regarded merely as Jewish expressions. There is no need for me to go through them in detail; but I will call attention generally to the fact that the Jews employed such phrases not only rhetorically, but also, and indeed chiefly, from devotional motives. Such is the reason for the substitution of "bless God" for "curse God" (in 1 Kings xxi. 10, and Job ii. 9), and for all things being referred to God, whence it appears that the Bible seems to relate nothing but miracles, even when speaking of the most ordinary occurrences, as in the examples given above.

Hence we must believe that when the Bible says that the Lord hardened Pharaoh's heart, it only means that Pharaoh was obstinate; when it says that God opened the windows of heaven, it only means that it rained very hard, and so on. When we reflect on these peculiarities, and also on the fact that most things are related very shortly, with very little detail, and almost in abridgments, we shall see that there is hardly anything in Scripture which can be proved contrary to natural reason, while, on the other hand, many things which before seemed obscure, will after a little consideration be understood and easily explained.

I think I have now very clearly explained all that I proposed to explain, but before I finish this chapter I would call attention to the fact that I have adopted a different method in speaking of miracles to that which I employed in treating of prophecy. Of prophecy I have asserted nothing which could not be inferred from premises revealed in Scripture, whereas in this chapter I have deduced my conclusions solely from the principles ascertained by the natural light of reason. I have proceeded in this way advisedly, for prophecy, in that it surpasses human knowledge, is a purely theological question; therefore, I knew that I could not make any assertions about it, nor learn wherein it consists, except through deductions from premises that have been revealed; therefore I was compelled to collate the history of prophecy, and to draw therefrom certain conclusions which would teach me, in so far as such teaching is possible, the nature and properties of the gift. But in the case of miracles, as our inquiry is a question purely philosophical (namely, whether anything can happen which contravenes, or does not follow from the laws of Nature), I was not under any such necessity: I therefore thought it wiser to unravel the difficulty through premises ascertained and thoroughly known by the natural light of reason. I say I thought it wiser, for I could also easily have solved the problem merely from the doctrines and fundamental principles of Scripture: in order that every one may acknowledge this, I will briefly show how it could be done.

Scripture makes the general assertion in several passages that nature's course is fixed and unchangeable. (In Ps. cxlviii. 6, for instance, and Jer. xxxi. 35.) The wise man also (in Eccles. i. 10) distinctly teaches that "there is nothing new under the sun," and (in verses 11, 12), illustrating the same idea, he adds that although something occasionally happens which seems new, it is not really new, but "hath been already of old time, which was before us, whereof there is no remembrance, neither shall there be any remembrance of things that are to come with those that come after." Again (in chap. iii. 11), he says, "God hath made everything beautiful in his time," and immediately afterwards adds, "I know that whatsoever God doeth, it shall be for ever; nothing can be put to it, nor anything taken from it."

Now all these texts teach most distinctly that Nature preserves a fixed and unchangeable order and that God in all ages known and unknown has been the same; further, that the laws of Nature are so perfect that nothing can be added thereto nor taken therefrom; and, lastly, that miracles only appear as something new because of man's ignorance.

Such is the express teaching of Scripture. Nowhere does Scripture assert that anything happens which contradicts, or cannot follow from the laws of Nature; and therefore we should not attribute to it such a doctrine....

The conclusion, then, that is most plainly put before us is, that miracles were natural occurrences, and must therefore be so explained as to appear neither new (in the words of Solomon) nor contrary to Nature, but, as far as possible, in complete agreement with ordinary events. This can easily be done by any one, now that I have set forth the rules drawn from Scripture. Nevertheless, though I maintain that Scripture teaches this doctrine, I do not assert that it teaches it as a truth necessary to salvation, but only that the prophets were in agreement with ourselves on the point; therefore every one is free to think on the subject as he likes, according as he thinks it best for himself, and most likely to conduce to the worship of God and to single-hearted religion.

FOOTNOTES:

[10] From the Tr. Th.-P., ch. vi, same title.

[11] N.B. I do not mean here by "Nature," merely matter and its modifications, but infinite other things besides matter.



CHAPTER VIII

OF THE DIVINE NATURE

Definitions

I. By cause of itself, I understand that, whose essence involves existence; or that, whose nature cannot be conceived unless existing.

II. That thing is called finite in its own kind (in suo genere) which can be limited by another thing of the same nature. For example, a body is called finite, because we always conceive another which is greater. So a thought is limited by another thought; but a body is not limited by a thought, nor a thought by a body.

III. By substance, I understand that which is in itself and is conceived through itself; in other words, that, the conception of which does not need the conception of another thing from which it must be formed.

IV. By attribute, I understand that which the intellect perceives of substance, as constituting its essence.

V. By mode, I understand the affections of substance, or that which is in another thing through which also it is conceived.

VI. By God, I understand Being absolutely infinite, that is to say, substance consisting of infinite attributes, each one of which expresses eternal and infinite essence.

Explanation.—I say absolutely infinite but not infinite in its own kind (in suo genere); for of whatever is infinite only in its own kind (in suo genere), we can deny infinite attributes; but to the essence of that which is absolutely infinite pertains whatever expresses essence and involves no negation.

VII. That thing is called free which exists from the necessity of its own nature alone, and is determined to action by itself alone. That thing, on the other hand, is called necessary, or rather compelled, which by another is determined to existence and action in a fixed and prescribed manner.

VIII. By eternity, I understand existence itself, so far as it is conceived necessarily to follow from the definition alone of the eternal thing.

Explanation.—For such existence, like the essence of the thing, is conceived as an eternal truth. It cannot therefore be explained by duration of time, even if the duration be conceived without beginning or end.

Axioms

I. Everything which is, is either in itself or in another.

II. That which cannot be conceived through another must be conceived through itself.

III. From a given determinate cause an effect necessarily follows; and, on the other hand, if no determinate cause be given, it is impossible that an effect can follow.

IV. The knowledge (cognitio) of an effect depends upon and involves the knowledge of the cause.

V. Those things which have nothing mutually in common with one another cannot through one another be mutually understood, that is to say, the conception of the one does not involve the conception of the other.

VI. A true idea must agree with that of which it is the idea (cum suo ideato).

VII. The essence of that thing which can be conceived as not existing does not involve existence.

The Essence of God

God, or substance consisting of infinite attributes, each one of which expresses eternal and infinite essence, necessarily exists.

[This can be proved in the following manner]:

For the existence or non-existence of everything there must be a reason or cause. For example, if a triangle exists, there must be a reason or cause why it exists; and if it does not exist, there must be a reason or cause which hinders its existence or which negates it. But this reason or cause must either be contained in the nature of the thing or lie outside it. For example, the nature of the thing itself shows the reason why a square circle does not exist, the reason being that a square circle involves a contradiction. And the reason, on the other hand, why substance exists follows from its nature alone, which involves existence. But the reason why a circle or triangle exists or does not exist is not drawn from their nature, but from the order of corporeal nature generally; for from that it must follow either that a triangle necessarily exists, or that it is impossible for it to exist. But this is self-evident. Therefore it follows that if there be no cause nor reason which hinders a thing from existing, it exists necessarily. If therefore there be no reason nor cause which hinders God from existing, or which negates His existence, we must conclude absolutely that He necessarily exists. But if there be such a reason or cause, it must be either in the nature itself of God or must lie outside it, that is to say, in another substance of another nature. For if the reason lay in a substance of the same nature, the existence of God would be by this very fact admitted. But substance possessing another nature could have nothing in common with God, and therefore could not give Him existence nor negate it. Since, therefore, the reason or cause which could negate the divine existence cannot be outside the divine nature, it will necessarily, supposing that the divine nature does not exist, be in His nature itself, which would therefore involve a contradiction. But to affirm this of the Being absolutely infinite and consummately perfect is absurd. Therefore neither in God nor outside God is there any cause or reason which can negate His existence, and therefore God necessarily exists....

The Corporeality of God

There are those who imagine God to be like a man, composed of body and soul and subject to passions; but it is clear enough from what has already been demonstrated how far off men who believe this are from the true knowledge of God. But these I dismiss, for all men who have in any way looked into the divine nature deny that God is corporeal. That He cannot be so they conclusively prove by showing that by "body" we understand a certain quantity possessing length, breadth, and depth, limited by some fixed form; and that to attribute these to God, a being absolutely infinite, is the greatest absurdity. But yet at the same time, from other arguments by which they endeavor to confirm their proof, they clearly show that they remove altogether from the divine nature substance itself corporeal or extended, affirming that it was created by God. By what divine power, however, it could have been created they are altogether ignorant, so that it is clear they do not understand what they themselves say....

B / / / A C

But I will refute my adversaries' arguments, which, taken altogether, come to this. First, that corporeal substance, in so far as it is substance, consists, as they suppose, of parts, and therefore they deny that it can be infinite, and consequently that it can pertain to God. This they illustrate by many examples, one or two of which I will adduce. If corporeal substance, they say, be infinite, let us conceive it to be divided into two parts; each part, therefore, will be either finite or infinite. If each part be finite, then the infinite is composed of two finite parts, which is absurd. If each part be infinite, there is then an infinite twice as great as another infinite, which is also absurd. Again, if infinite quantity be measured by equal parts of a foot each, it must contain an infinite number of such parts, and similarly if it be measured by equal parts of an inch each; and therefore one infinite number will be twelve times greater than another infinite number. Lastly, if from one point of any infinite quantity it be imagined that two lines, AB, AC, which at first are at a certain and determinate distance from one another, be infinitely extended, it is plain that the distance between B and C will be continually increased, and at length from being determinate will be indeterminable. Since therefore these absurdities follow, as they think, from supposing quantity to be infinite, they conclude that corporeal substance must be finite, and consequently cannot pertain to the essence of God. A second argument is assumed from the absolute perfection of God. For God, they say, since He is a being absolutely perfect, cannot suffer; but corporeal substance, since it is divisible, can suffer: it follows, therefore, that it does not pertain to God's essence.

These are the arguments which I find in authors, by which they endeavor to show that corporeal substance is unworthy of the divine nature, and cannot pertain to it.... If any one will rightly consider the matter, he will see that all these absurdities (supposing that they are all absurdities, a point which I will now take for granted), from which these authors attempt to draw the conclusion that substance extended is finite, do not by any means follow from the supposition that quantity is infinite, but from the supposition that infinite quantity is measurable, and that it is made up of finite parts. Therefore, from the absurdities to which this leads nothing can be concluded, excepting that infinite quantity is not measurable, and that it cannot be composed of finite parts. But this is what we [maintain].

... The shaft therefore which is aimed at us turns against those who cast it. If, therefore, from these absurdities any one should attempt to conclude that substance extended must be finite, he would, forsooth, be in the position of the man who supposes a circle to have the properties of a square, and then concludes that it has no center, such that all the lines drawn from it to the circumference are equal. For corporeal substance, which cannot be conceived except as infinite, one and indivisible, is conceived by those against whom I argue to be composed of finite parts, and to be multiplex and divisible, in order that they may prove it finite. Just in the same way others, after they have imagined a line to consist of points, know how to discover many arguments, by which they show that a line cannot be divided ad infinitum; and indeed it is not less absurd to suppose that corporeal substance is composed of bodies or parts than to suppose that a body is composed of surfaces, surfaces of lines, and that lines, finally, are composed of points. Every one who knows that clear reason is infallible ought to admit this, and especially those who deny that a vacuum can exist. For if corporeal substance could be so divided that its parts could be really distinct, why could not one part be annihilated, the rest remaining, as before, connected with one another? And why must all be so fitted together that there can be no vacuum? For of things which are really distinct the one from the other, one can be and remain in its own position without the other. Since therefore it is supposed that there is no vacuum in Nature (about which I will speak at another time), but that all the parts must be united, so that no vacuum can exist, it follows that they cannot be really separated; that is to say, that corporeal substance, in so far as it is substance, cannot be divided.

If, nevertheless, any one should now ask why there is a natural tendency to consider quantity as capable of division, I reply that quantity is conceived by us in two ways: either abstractly or superficially; that is to say, as we imagine it, or else as substance, in which way it is conceived by the intellect alone. If, therefore, we regard quantity (as we do very often and easily) as it exists in the imagination, we find it to be finite, divisible, and composed of parts; but if we regard it as it exists in the intellect, and conceive it in so far as it is substance, which is very difficult, then, as we have already sufficiently demonstrated, we find it to be infinite, one, and indivisible.

This will be plain enough to all who know how to distinguish between the imagination and the intellect, and more especially if we remember that matter is everywhere the same, and that, except in so far as we regard it as affected in different ways, parts are not distinguished in it; that is to say, they are distinguished with regard to mode, but not with regard to reality. For example, we conceive water as being divided, in so far as it is water, and that its parts are separated from one another; but in so far as it is corporeal substance we cannot thus conceive it, for as such it is neither separated nor divided. Moreover, water, in so far as it is water, is originated and destroyed; but in so far as it is substance, it is neither originated nor destroyed.

By this reasoning I think that I have also answered the second argument, since that too is based upon the assumption that matter, considered as substance, is divisible and composed of parts. And even if what I have urged were not true, I do not know why matter should be unworthy of the divine nature, since outside God no substance can exist from which the divine nature could suffer. All things, I say, are in God, and everything which takes place by the laws alone of the infinite nature of God, and follows (as I shall presently show) from the necessity of His essence. Therefore in no way whatever can it be asserted that God suffers from anything, or that substance extended, even if it be supposed divisible, is unworthy of the divine nature, provided only it be allowed that it is eternal and infinite.... Whatever is, is in God, and nothing can either be or be conceived without God.

The Properties of God

I

From the necessity of the divine nature infinite numbers of things in infinite ways (that is to say, all things which can be conceived by the infinite intellect) must follow.

This proposition must be plain to every one who considers that from the given definition of anything a number of properties necessarily following from it (that is to say, following from the essence of the thing itself) are inferred by the intellect, and just in proportion as the definition of the thing expresses a greater reality, that is to say, just in proportion as the essence of the thing defined involves a greater reality, will more properties be inferred. But the divine nature possesses absolutely infinite attributes (Def. 6), each one of which expresses infinite essence in its own kind (in suo genere), and therefore, from the necessity of the divine nature, infinite numbers of things in infinite ways (that is to say, all things which can be conceived by the infinite intellect) must necessarily follow. Hence it follows that God is the efficient cause of all things which can fall under the infinite intellect. It follows, secondly, that God is cause through Himself, and not through that which is contingent (per accidens). It follows, thirdly, that God is absolutely the first cause.

II

We have just shown that from the necessity, or (which is the same thing) from the laws only of the divine nature, infinite numbers of things absolutely follow: and we have demonstrated that nothing can be, nor can be conceived, without God, but that all things are in God. Therefore, outside Himself, there can be nothing by which He may be determined or compelled to act; and therefore He acts from the laws of His own nature only, and is compelled by no one.

Hence it follows, firstly, that there is no cause, either external to God or within Him, which can excite Him to act except the perfection of His own nature. It follows, secondly, that God alone is a free cause; for God alone exists from the necessity alone of His own nature and acts from the necessity alone of His own nature. Therefore He alone is a free cause.

There are some who think that God is a free cause because He can, as they think, bring about that those things which we have said follow from His nature—that is to say, those things which are in His power—should not be, or should not be produced by Him. But this is simply saying that God could bring about that it should not follow from the nature of a triangle that its three angles should be equal to two right angles, or that from a given cause an effect should not follow, which is absurd. But I shall show farther on, without the help of this proposition, that neither intellect nor will pertain to the nature of God.

I know indeed that there are many who think themselves able to demonstrate that intellect of the highest order and freedom of will both pertain to the nature of God, for they say that they know nothing more perfect which they can attribute to Him than that which is the chief perfection in ourselves. But although they conceive God as actually possessing the highest intellect, they nevertheless do not believe that He can bring about that all those things should exist which are actually in His intellect, for they think that by such a supposition they would destroy His power. If He had created, they say, all things which are in His intellect, He could have created nothing more, and this, they believe, does not accord with God's omnipotence; so then they prefer to consider God as indifferent to all things, and creating nothing except that which He has decreed to create by a certain absolute will. But I think that I have shown with sufficient clearness that from the supreme power of God, or from His infinite nature, infinite things in infinite ways, that is to say, all things, have necessarily flowed, or continually follow by the same necessity, in the same way as it follows from the nature of a triangle, from eternity and to eternity, that its three angles are equal to two right angles. The omnipotence of God has therefore been actual from eternity, and in the same actuality will remain to eternity. In this way the omnipotence of God, in my opinion, is far more firmly established.

My adversaries, indeed (if I may be permitted to speak plainly), seem to deny the omnipotence of God, inasmuch as they are forced to admit that He has in His mind an infinite number of things which might be created, but which, nevertheless, He will never be able to create, for if He were to create all things which He has in His mind, He would, according to them, exhaust His omnipotence and make Himself imperfect. Therefore, in order to make a perfect God, they are compelled to make Him incapable of doing all those things to which His power extends, and anything more absurd than this, or more opposed to God's omnipotence, I do not think can be imagined.

Moreover—to say a word, too, here about the intellect and will which we commonly attribute to God—if intellect and will pertain to His eternal essence, these attributes cannot be understood in the sense in which men generally use them, for the intellect and will which could constitute His essence would have to differ entirely from our intellect and will, and could resemble ours in nothing except in name. There could be no further likeness than that between the celestial constellation of the Dog and the animal which barks. This I will demonstrate as follows: If intellect pertains to the divine nature, it cannot, like our intellect, follow the things which are its object (as many suppose), nor can it be simultaneous in its nature with them, since God is prior to all things in causality; but, on the contrary, the truth and formal essence of things is what it is, because as such it exists objectively in God's intellect. Therefore the intellect of God, in so far as it is conceived to constitute His essence, is in truth the cause of things, both of their essence and of their existence,—a truth which seems to have been understood by those who have maintained that God's intellect, will, and power are one and the same thing.

Since, therefore, God's intellect is the sole cause of things, both of their essence and of their existence (as we have already shown), it must necessarily differ from them with regard both to its essence and existence; for an effect differs from its cause precisely in that which it has from its cause. For example, one man is the cause of the existence but not of the essence of another, for the essence is an eternal truth; and therefore with regard to essence the two men may exactly resemble one another, but with regard to existence they must differ. Consequently if the existence of one should perish, that of the other will not therefore perish; but if the essence of one could be destroyed and become false, the essence of the other would be likewise destroyed. Therefore a thing which is the cause both of the essence and of the existence of any effect must differ from that effect both with regard to its essence and with regard to its existence. But the intellect of God is the cause both of the essence and existence of our intellect; therefore the intellect of God, so far as it is conceived to constitute the divine essence, differs from our intellect both with regard to its essence and its existence, nor can it coincide with our intellect in anything except the name, which is what we essayed to prove. The same demonstration may be applied to the will, as any one may easily see for himself.

III

All things which are, are in God and must be conceived through Him and therefore He is the cause of the things which are in Himself. Moreover, outside God there can be no substance, that is to say (Def. 3), outside Him nothing can exist which is in itself. God, therefore, is the immanent, but not the transitive cause of all things.

The Necessity of All Things

In nature there is nothing contingent, but all things are determined from the necessity of the divine nature to exist and act in a certain manner.... That which has not been thus determined by God cannot determine itself to action. A thing which has been determined by God to any action cannot render itself indeterminate.

... All things have necessarily followed from the given nature of God and from the necessity of His nature have been determined to existence and action in a certain manner. If therefore things could have been of another nature, or could have been determined in another manner to action, so that the order of nature would have been different, the nature of God might then be different to that which it now is, and hence that different nature would necessarily exist, and there might consequently be two or more Gods, which is absurd. Therefore things could be produced by God in no other manner and in no other order than that in which they have been produced.

Since I have thus shown, with greater clearness, than that of noonday light, that in things there is absolutely nothing by virtue of which they can be called contingent, I wish now to explain in a few words what is to be understood by contingent, but, firstly, what is to be understood by necessary and impossible.

A thing is called necessary either in reference to its essence or its cause. For the existence of a thing necessarily follows either from the essence and definition of the thing itself, or from a given efficient cause. In the same way a thing is said to be impossible either because the essence of the thing itself or its definition involves a contradiction, or because no external cause exists determinate to the production of such a thing. But a thing cannot be called contingent unless with reference to a deficiency in our knowledge. For if we do not know that the essence of a thing involves a contradiction, or if we actually know that it involves no contradiction, and nevertheless we can affirm nothing with certainty about its existence because the order of causes is concealed from us, that thing can never appear to us either as necessary or impossible, and therefore we call it either contingent or possible.

From what has gone before it clearly follows that things have been produced by God in the highest degree of perfection, since they have necessarily followed from the existence of a most perfect nature. Nor does this doctrine accuse God of any imperfection, but, on the contrary, His perfection has compelled us to affirm it. Indeed, from its contrary would clearly follow, as I have shown above, that God is not absolutely perfect, since, if things had been produced in any other fashion, another nature would have had to be assigned to Him, different from that which the consideration of the most perfect Being compels us to assign to Him. I do not doubt that many will reject this opinion as ridiculous, nor will they care to apply themselves to its consideration, and this from no other reason than that they have been in the habit of assigning to God another liberty widely different from that absolute will which (Def. 7) we have taught. On the other hand, I do not doubt, if they were willing to study the matter and properly to consider the series of our demonstrations, that they would altogether reject this liberty which they now assign to God, not only as of no value, but as a great obstacle to knowledge. Neither is there any need that I should here repeat those things which are said [above][12].

But for the sake of those who differ from me, I will here show that although it be granted that will pertains to God's essence, it follows nevertheless from His perfection that things could be created in no other mode or order by Him. This it will be easy to show if we first consider that which my opponents themselves admit, that it depends upon the decree and will of God alone that each thing should be what it is, for otherwise God would not be the cause of all things. It is also admitted that all God's decrees were decreed by God Himself from all eternity, for otherwise imperfection and inconstancy would be proved against Him. But since in eternity there is no when nor before nor after, it follows from the perfection of God alone that He neither can decree nor could ever have decreed anything else than that which He has decreed; that is to say, God has not existed before His decrees, and can never exist without them. But it is said that although it be supposed that God had made the nature of things different from that which it is, or that from eternity He had decreed something else about Nature and her order, it would not thence follow that any imperfection exists in God. But if this be said, it must at the same time be allowed that God can change His decrees. For if God had decreed something about Nature and her order other than that which He has decreed—that is to say, if He had willed and conceived something else about Nature—He would necessarily have had an intellect and a will different from those which He now has. And if it be allowed to assign to God another intellect and another will without any change of His essence and of His perfection, what is the reason why He cannot now change His decrees about creation and nevertheless remain equally perfect? For His intellect and will regarding created things and their order remain the same in relationship to His essence and perfection in whatever manner His intellect and will are conceived.

Moreover, all the philosophers whom I have seen admit that there is no such thing as an intellect existing potentially in God, but only an intellect existing actually. But since His intellect and His will are not distinguishable from His essence, as all admit, it follows from this also that if God had had another intellect actually and another will, His essence would have been necessarily different, and hence, as I showed at the beginning, if things had been produced by God in a manner different from that in which they now exist, God's intellect and will, that is to say, His essence (as has been granted), must have been different, which is absurd.

Since, therefore, things could have been produced by God in no other manner or order, this being a truth which follows from His absolute perfection, there is no sound reasoning which can persuade us to believe that God was unwilling to create all things which are in His intellect with the same perfection as that in which they exist in His intellect. But we shall be told that there is no perfection nor imperfection in things, but that that which is in them by reason of which they are perfect or imperfect and are said to be good or evil depends upon the will of God alone, and therefore if God had willed He could have effected that that which is now perfection should have been the extreme of imperfection, and vice versa. But what else would this be than openly to affirm that God, who necessarily understands what He wills, is able by His will to understand things in a manner different from that in which He understands them, which, as I have just shown, is a great absurdity? I can therefore turn the argument on my opponents in this way. All things depend upon the power of God. In order that things may be differently constituted, it would be necessary that God's will should be differently constituted; but God's will cannot be other than it is as we have lately most clearly deduced from His perfection. Things therefore cannot be differently constituted.

I confess that this opinion, which subjects all things to a certain indifferent God's will, and affirms that all things depend upon God's good pleasure, is at a less distance from the truth than the opinion of those who affirm that God does everything for the sake of the Good. For these seem to place something outside of God which is independent of Him, to which He looks while He is at work as to a model, or at which He aims as if at a certain mark. This is indeed nothing else than to subject God to fate, the most absurd thing which can be affirmed of Him whom we have shown to be the first and only free cause of the essence of all things as well as of their existence. Therefore it is not worth while that I should waste time in refuting this absurdity.

Before I go any farther, I wish here to explain or rather to recall to recollection, what we mean by natura naturans and what by natura naturata. For, from what has gone before, I think it is plain that by natura naturans we are to understand that which is in itself and is conceived through itself, or those attributes of substance which express eternal and infinite essence, that is to say, God in so far as He is considered as a free cause. But by natura naturata I understand everything which follows from the necessity of the nature of God, or of any one of God's attributes, that is to say, all the modes of God's attributes in so far as they are considered as things which are in God, and which without God can neither be nor can be conceived.

... Individual things are nothing but affections or modes of God's attributes, expressing those attributes in a certain and determinate manner.

General Conclusions

I have now explained the nature of God and its properties. I have shown that He necessarily exists; that He is one God; that from the necessity alone of His own nature He is and acts; that He is, and in what way He is, the free cause of all things; that all things are in Him, and so depend upon Him that without Him they can neither be nor can be conceived; and, finally, that all things have been predetermined by Him, not indeed from freedom of will or from absolute good pleasure, but from His absolute nature or infinite power.

Moreover, wherever an opportunity was afforded, I have endeavored to remove prejudices which might hinder the perception of the truth of what I have demonstrated; but because not a few still remain which have been and are now sufficient to prove a very great hindrance to the comprehension of the connection of things in the manner in which I have explained it, I have thought it worth while to call them up to be examined by reason. But all these prejudices which I here undertake to point out depend upon this solely: that it is commonly supposed that all things in Nature, like men, work to some end; and indeed it is thought to be certain that God Himself directs all things to some sure end, for it is said that God has made all things for man, and man that he may worship God.

This, therefore, I will first investigate by inquiring, firstly, why so many rest in this prejudice, and why all are so naturally inclined to embrace it? I shall then show its falsity, and, finally, the manner in which there have arisen from it prejudices concerning good and evil, merit and sin, praise and blame, order and disorder, beauty and deformity, and so forth. This, however, is not the place to deduce these things from the nature of the human mind. It will be sufficient if I here take as an axiom that which no one ought to dispute, namely, that man is born ignorant of the causes of things, and that he has a desire, of which he is conscious, to seek that which is profitable to him. From this it follows, firstly, that he thinks himself free because he is conscious of his wishes and appetites, whilst at the same time he is ignorant of the causes by which he is led to wish and desire, not dreaming what they are; and, secondly, it follows that man does everything for an end, namely, for that which is profitable to him, which is what he seeks. Hence it happens that he attempts to discover merely the final causes of that which has happened; and when he has heard them he is satisfied, because there is no longer any cause for further uncertainty. But if he cannot hear from another what these final causes are, nothing remains but to turn to himself and reflect upon the ends which usually determine him to the like actions, and thus by his own mind he necessarily judges that of another.

Moreover, since he discovers, both within and without himself a multitude of means which contribute not a little to the attainment of what is profitable to himself—for example, the eyes, which are useful for seeing, the teeth for mastication, plants and animals for nourishment, the sun for giving light, the sea for feeding fish, etc.—it comes to pass that all natural objects are considered as means for obtaining what is profitable. These too being evidently discovered and not created by man, hence he has a cause for believing that some other person exists, who has prepared them for man's use. For having considered them as means it was impossible to believe that they had created themselves, and so he was obliged to infer from the means which he was in the habit of providing for himself that some ruler or rulers of Nature exist, endowed with human liberty, who have taken care of all things for him, and have made all things for his use. Since he never heard anything about the mind of these rulers, he was compelled to judge of it from his own, and hence he affirmed that the gods direct everything for his advantage, in order that he may be bound to them and hold them in the highest honor. This is the reason why each man has devised for himself, out of his own brain, a different mode of worshiping God, so that God might love him above others, and direct all Nature to the service of his blind cupidity and insatiable avarice.

Thus has this prejudice been turned into a superstition and has driven deep roots into the mind—a prejudice which was the reason why every one has so eagerly tried to discover and explain the final causes of things. The attempt, however, to show that Nature does nothing in vain (that is to say, nothing which is not profitable to man), seems to end in showing that Nature, the gods, and man are alike mad.

Do but see, I pray, to what all this has led. Amidst so much in Nature that is beneficial, not a few things must have been observed which are injurious, such as storms, earthquakes, diseases, and it was affirmed that these things happened either because the gods were angry because of wrongs which had been inflicted on them by man, or because of sins committed in the method of worshiping them; and although experience daily contradicted this, and showed by an infinity of examples that both the beneficial and the injurious were indiscriminately bestowed on the pious and the impious, the inveterate prejudices on this point have not therefore been abandoned. For it was much easier for a man to place these things aside with others of the use of which he was ignorant, and thus retain his present and inborn state of ignorance, than to destroy the whole superstructure and think out a new one. Hence it was looked upon as indisputable that the judgments of the gods far surpass our comprehension; and this opinion alone would have been sufficient to keep the human race in darkness to all eternity, if mathematics, which does not deal with ends, but with the essences and properties of forms, had not placed before us another rule of truth. In addition to mathematics, other causes also might be assigned, which it is superfluous here to enumerate, tending to make men reflect upon these universal prejudices, and leading them to a true knowledge of things.

I have thus sufficiently explained what I promised in the first place to explain. There will now be no need of many words to show that Nature has set no end before herself, and that all final causes are nothing but human fictions. For I believe that this is sufficiently evident both from the foundations and causes of this prejudice, as well as from all those propositions in which I have shown that all things are begotten by a certain eternal necessity of Nature and in absolute perfection. Thus much, nevertheless, I will add, that this doctrine concerning an end altogether overturns nature. For that which is in truth the cause it considers as the effect, and vice versa. Again, that which is first in Nature it puts last; and, finally, that which is supreme and most perfect it makes the most imperfect. For, passing by the first two assertions as self-evident, it is plain that that effect is the most perfect which is immediately produced by God, and in proportion as intermediate causes are necessary for the production of a thing is it imperfect. But if things which are immediately produced by God were made in order that He might obtain the end He had in view, then the last things for the sake of which the first exist, must be the most perfect of all.

Again, this doctrine does away with God's perfection. For if God works to obtain an end, He necessarily seeks something of which he stands in need. And although theologians and metaphysicians distinguish between the end of want and the end of assimilation (finem indigentiae et finem assimilationis), they confess that God has done all things for His own sake, and not for the sake of the things to be created, because before the creation they can assign nothing excepting God for the sake of which God could do anything; and therefore they are necessarily compelled to admit that God stood in need of and desired those things for which He determined to prepare means. This is self-evident. Nor is it here to be overlooked that the adherents of this doctrine, who have found a pleasure in displaying their ingenuity in assigning the ends of things, have introduced a new species of argument, not the reductio ad impossible, but the reductio ad ignorantiam, to prove their position, which shows that it had no other method of defense left.

For, by way of example, if a stone had fallen from some roof on somebody's head and killed him, they will demonstrate in this manner that the stone has fallen in order to kill the man. For if it did not fall for that purpose by the will of God, how could so many circumstances concur through chance (and a number often simultaneously do concur)? You will answer, perhaps, that the event happened because the wind blew and the man was passing that way. But, they will urge, why did the wind blow at that time, and why did the man pass that way precisely at the same moment? If you again reply that the wind rose then because the sea on the preceding day began to be stormy, the weather hitherto having been calm, and that the man had been invited by a friend, they will urge again—because there is no end of questioning—But why was the sea agitated? why was the man invited at that time? And so they will not cease from asking the causes of causes, until at last you fly to the will of God, the refuge for ignorance.

So, also, when they behold the structure of the human body, they are amazed; and because they are ignorant of the causes of such art, they conclude that the body was made not by mechanical but by a supernatural or divine art, and has been formed in such a way so that the one part may not injure the other. Hence it happens that the man who endeavors to find out the true causes of miracles, and who desires as a wise man to understand Nature, and not to gape at it like a fool, is generally considered and proclaimed to be a heretic and impious by those whom the vulgar worship as the interpreters both of Nature and the gods. For these know that if ignorance be removed, amazed stupidity, the sole ground on which they rely in arguing or in defending their authority, is taken away also. But these things I leave and pass on to that which I determined to do in the third place.

After man has persuaded himself that all things which exist are made for him, he must in everything adjudge that to be of the greatest importance which is most useful to him, and he must esteem that to be of surpassing worth by which he is most beneficially affected. In this way he is compelled to form those notions by which he explains Nature; such, for instance, as good, evil, order, confusion, heat, cold, beauty, and deformity, etc.; and because he supposes himself to be free, notions like those of praise and blame, sin and merit, have arisen. These latter I shall hereafter explain when I have treated of human nature; the former I will here briefly unfold.

It is to be observed that man has given the name good to everything which leads to health and the worship of God; on the contrary, everything which does not lead thereto he calls evil. But because those who do not understand Nature affirm nothing about things themselves, but only imagine them, and take the imagination to be understanding, they therefore, ignorant of things and their nature, firmly believe an order to be in things; for when things are so placed that if they are represented to us through the senses, we can easily imagine them, and consequently easily remember them, we call them well arranged; but if they are not placed so that we can imagine and remember them, we call them badly arranged or confused. Moreover, since those things are more especially pleasing to us which we can easily imagine, men therefore prefer order to confusion, as if order were something in Nature apart from our own imagination; and they say that God has created everything in order, and in this manner they ignorantly attribute imagination to God, unless they mean perhaps that God, out of consideration for the human imagination, has disposed things in the manner in which they can most easily be imagined. No hesitation either seems to be caused by the fact that an infinite number of things are discovered which far surpass our imagination, and very many which confound it through its weakness. But enough of this.

The other notions which I have mentioned are nothing but modes in which the imagination is affected in different ways, and nevertheless they are regarded by the ignorant as being specially attributes of things, because, as we have remarked, men consider all things as made for themselves, and call the nature of a thing good, evil, sound, putrid, or corrupt, just as they are affected by it. For example, if the motion by which the nerves are affected by means of objects represented to the eye conduces to well-being, the objects by which it is caused are called beautiful; while those exciting a contrary motion are called deformed. Those things, too, which stimulate the senses through the nostrils are called sweet-smelling or stinking; those which act through the taste are called sweet or bitter, full-flavored or insipid; those which act through the touch, hard or soft, heavy or light; those, lastly, which act through the ears are said to make a noise, sound, or harmony, the last having caused men to lose their senses to such a degree that they have believed that God even is delighted with it. Indeed, philosophers may be found who have persuaded themselves that the celestial motions beget a harmony.

All these things sufficiently show that every one judges things by the constitution of his brain, or rather accepts the affections of his imagination in the place of things.[13] It is not, therefore, to be wondered at, as we may observe in passing, that all those controversies which we see have arisen amongst men, so that at last skepticism has been the result. For although human bodies agree in many things, they differ in more, and therefore that which to one person is good will appear to another evil, that which to one is well arranged to another is confused, that which pleases one will displease another, and so on in other cases which I pass by both because we cannot notice them at length here, and because they are within the experience of every one. For every one has heard the expressions: So many heads, so many ways of thinking; Every one is satisfied with his own way of thinking; Differences of brains are not less common than differences of taste;—all which maxims show that men decide upon matters according to the constitution of their brains, and imagine rather than understand things.

If men understood things, they would, as mathematics prove, at least be all alike convinced if they were not all alike attracted. We see, therefore, that all those methods by which the common people are in the habit of explaining Nature are only different sorts of imaginations, and do not reveal the nature of anything in itself, but only the constitution of the imagination; and because they have names as if they were entities existing apart from the imagination, I call them entities not of the reason but of the imagination. All argument therefore, urged against us based upon such notions can be easily refuted.

Many people, for instance, are accustomed to argue thus:—If all things have followed from the necessity of the most perfect nature of God, how is it that so many imperfections have arisen in Nature—corruption, for instance, of things till they stink; deformity, exciting disgust; confusion, evil, crime, etc.? But, as I have just observed, all this is easily answered. For the perfection of things is to be judged by their nature and power alone; nor are they more or less perfect because they delight or offend the human senses, or because they are beneficial or prejudicial to human nature. But to those who ask why God has not created all men in such a manner that they might be controlled by the dictates of reason alone, I give but this answer: Because to Him material was not wanting for the creation of everything, from the highest down to the very lowest grade of perfection; or, to speak more properly, because the laws of His nature were so ample that they sufficed for the production of everything which can be conceived by an infinite intellect, as I have demonstrated.

These are the prejudices which I undertook to notice here. If any others of a similar character remain, they can easily be rectified with a little thought by any one.

FOOTNOTES:

[12] Pp. 132-135.

[13] Beauty, my dear Sir, is not so much a quality of the object beheld, as an effect in him who beholds it. If our sight were longer or shorter, or, if our constitution were different, what now appears beautiful to us would seem misshapen and what we now think misshapen we should regard as beautiful. The most beautiful hand seen through the microscope will appear horrible. Some things are beautiful at a distance, but ugly near; thus things regarded in themselves, and in relation to God, are neither ugly nor beautiful. Therefore, he who says that God has created the world so that it might be beautiful is bound to adopt one of the two alternatives: either that God created the world for the sake of men's pleasure and eyesight, or else that He created men's pleasure and eyesight for the sake of the world. From a letter to Hugo Boxel (1674).



SECOND PART

ON MAN

The more things the mind knows, the better it understands its own powers and the order of Nature. The better it understands its own powers, so much the more easily can it direct itself and propose rules to itself. The better, also, it understands the order of Nature, the more easily can it restrain itself from what is useless.

SPINOZA.



CHAPTER IX

THE NATURE AND ORIGIN OF THE HUMAN MIND

Introductory

I pass on now to explain those things which must necessarily follow from the essence of God or the Being eternal and infinite; not indeed to explain all these things, for we have demonstrated that an infinitude of things must follow in an infinite number of ways,—but to consider those things only which may conduct us, as it were, by the hand to a knowledge of the human mind and its highest happiness.

Definitions

I. By body, I understand a mode which expresses in a certain and determinate manner the essence of God in so far as He is considered as the thing extended.

II. I say that to the essence of anything pertains that, which being given, the thing itself is necessarily posited, and being taken away, the thing is necessarily taken; or, in other words, that, without which the thing can neither be nor be conceived, and which in its turn cannot be nor be conceived without the thing.

III. By idea, I understand a conception of the mind which the mind forms because it is a thinking thing.

Explanation.—I use the word conception rather than perception because the name perception seems to indicate that the mind is passive in its relation to the object. But the word conception seems to express the action of the mind.

IV. By adequate idea, I understand an idea which, in so far as it is considered in itself, without reference to the object, has all the properties or internal signs (denominationes intrinsecas) of a true idea.

Explanation.—I say internal, so as to exclude that which is external, the agreement, namely, of the idea with its object.

V. Duration is the indefinite continuation of existence.

Explanation.—I call it indefinite because it cannot be determined by the nature itself of the existing thing nor by the efficient cause, which necessarily posits the existence of the thing but does not take it away.

VI. By reality and perfection I understand the same thing.

VII. By individual things I understand things which are finite and which have a determinate existence; and if a number of individuals so unite in one action that they are all simultaneously the cause of one effect, I consider them all, so far, as one individual thing.

Axioms

I. The essence of man does not involve necessary existence; that is to say, the existence as well as the non-existence of this or that man may or may not follow from the order of Nature.

II. Man thinks.

III. Modes of thought, such as love, desire, or the emotions of the mind, by whatever name they may be called, do not exist, unless in the same individual the idea exist of a thing loved, desired, etc. But the idea may exist although no other mode of thinking exist.

IV. We perceive that a certain body is affected in many ways.

V. No individual things are felt or perceived by us excepting bodies and modes of thought.

The Mind of God

Individual thoughts, or this and that thought, are modes which express the nature of God in a certain and determinate manner. God therefore possesses an attribute, the conception of which is involved in all individual thoughts, and through which they are conceived. Thought, therefore, is one of the infinite attributes of God which expresses the eternal and infinite essence of God or, in other words, God is a thinking thing.

This proposition is plain from the fact that we can conceive an infinite thinking Being. For the more things a thinking being can think, the more reality or perfection we conceive it to possess, and therefore the being which can think an infinitude of things in infinite ways is necessarily infinite by his power of thinking. Since, therefore, we can conceive an infinite Being by attending to thought alone, thought is necessarily one of the infinite attributes of God.[14]

God can think an infinitude of things in infinite ways, or (which is the same thing) can form an idea of His essence and of all the things which necessarily follow from it. But everything which is in the power of God is necessary. Therefore in God there necessarily exists the idea of His essence, and of all things which necessarily follow from His essence.

The infinite intellect comprehends nothing but the attributes of God and His modes. But God is one. Therefore the idea of God, from which infinite numbers of things follow in infinite ways, can be one only.

The common people understand by God's power His free will and right over all existing things, which are therefore commonly looked upon as contingent; for they say that God has the power of destroying everything and reducing it to nothing. They very frequently, too, compare God's power with the power of kings. That there is any similarity between the two we have disproved. We have shown that God does everything with that necessity with which He understands Himself; that is to say, as it follows from the necessity of the divine nature that God understands Himself (a truth admitted by all), so by the same necessity it follows that God does an infinitude of things in infinite ways. Moreover, we have shown that the power of God is nothing but the active essence of God, and therefore it is as impossible for us to conceive that God does not act as that He does not exist. If it pleased me to go farther, I could show besides that the power which the common people ascribe to God is not only a human power (which shows that they look upon God as a man, or as being like a man), but that it also involves weakness. But I do not care to talk so much upon the same subject. Again and again I ask the reader to consider and reconsider what is said upon this subject [above].[15] For it is not possible for any one properly to understand the things which I wish to prove unless he takes great care not to confound the power of God with the human power and right of kings.

The Order and Dependence of Ideas in God

The formal Being of ideas is a mode of thought (as is self-evident); that is to say, a mode which expresses in a certain manner the nature of God in so far as He is a thinking thing. It is a mode, therefore, that involves the conception of no other attribute of God, and consequently is the effect of no other attribute except that of thought; therefore the formal Being of ideas recognizes God for its cause in so far only as He is considered as a thinking thing, and not in so far as He is manifested by any other attribute; that is to say, the ideas both of God's attributes and of individual things do not recognize as their efficient cause the objects of the ideas or the things which are perceived, but God Himself in so far as He is a thinking thing.[16]

God's power of thinking is equal to His actual power of acting; that is to say, whatever follows formally from the infinite nature of God, follows from the idea of God (idea Dei), in the same order and in the same connection objectively in God.

The order and connection of ideas is the same as the order and connection of things.

Before we go any farther, we must here recall to our memory what we have already demonstrated, that everything which can be perceived by the infinite intellect as constituting the essence of substance pertains entirely to the one sole substance only, and consequently that substance thinking and substance extended are one and the same substance, which is now comprehended under this attribute and now under that. Thus, also, a mode of extension and the idea of that mode are one and the same thing expressed in two different ways—a truth which some of the Hebrews appear to have seen as if through a cloud, since they say that God, the intellect of God, and the things which are the objects of that intellect are one and the same thing. For example, the circle existing in nature and the idea that is in God of an existing circle are one and the same thing, which is manifested through different attributes; and, therefore, whether we think of Nature under the attribute of extension, or under the attribute of thought, or under any other attribute whatever, we shall discover one and the same order, or one and the same connection of causes; that is to say, in every case the same sequence of things. Nor have I had any other reason for saying that God is the cause of the idea, for example, of the circle in so far only as He is a thinking thing, and of the circle itself in so far as He is an extended thing, but this, that the formal Being of the idea of a circle can only be perceived through another mode of thought, as its proximate cause, and this again must be perceived through another, and so on ad infinitum. So that when things are considered as modes of thought, we must explain the order of the whole of Nature or the connection of causes by the attribute of thought alone, and when things are considered as modes of extension, the order of the whole of Nature must be explained through the attribute of extension alone, and so with other attributes. Therefore God is in truth the cause of things as they are in themselves in so far as He consists of infinite attributes, nor for the present can I explain the matter more clearly.

The Origin of the Human Mind

The human mind is a part of the infinite intellect of God, and therefore, when we say that the human mind perceives this or that thing, we say nothing else than that God has this or that idea; not indeed in so far as He is infinite, but in so far as He is manifested through the nature of the human mind, or in so far as He forms the essence of the human mind; and when we say that God has this or that idea, not merely in so far as He forms the nature of the human mind, but in so far as He has at the same time with the human mind the idea also of another thing, then we say that the human mind perceives the thing partially or inadequately.

... When you ask me my opinion on the question[17] raised concerning our knowledge of the means, whereby each part of Nature agrees with its whole, and the manner in which it is associated with the remaining parts, I presume you are asking for the reasons which induce us to believe that each part of Nature agrees with its whole, and is associated with the remaining parts. For as to the means whereby the parts are really associated, and each part agrees with its whole, I told you in my former letter that I am in ignorance. To answer such a question we should have to know the whole of Nature and its several parts. I will therefore endeavor to show the reason which led me to make the statement; but I will promise that I do not attribute to Nature either beauty or deformity, order or confusion. Only in relation to our imagination can things be called beautiful or deformed, ordered or confused.

By the association of parts, then, I merely mean that the laws or nature of one part adapt themselves to the laws or nature of another part, so as to cause the least possible inconsistency. As to the whole and the parts, I mean that a given number of things are parts of a whole, in so far as the nature of each of them is adapted to the nature of the rest so that they all, as far as possible, agree together. On the other hand, in so far as they do not agree, each of them forms, in our minds, a separate idea, and is to that extent considered as a whole, not as a part. For instance, when the parts of lymph, chyle, etc., combine, according to the proportion of the figure and size of each, so as to evidently unite, and form one fluid, the chyle, lymph, etc., considered under this aspect, are part of the blood; but, in so far as we consider the particles of lymph as differing in figure and size from the particles of chyle, we shall consider each of the two as a whole, not as a part.

Let us imagine, with your permission, a little worm, living in the blood, able to distinguish by sight the particles of blood, lymph, etc., and to reflect on the manner in which each particle, on meeting with another particle, either is repulsed, or communicates a portion of its own motion. This little worm would live in the blood in the same way as we live in a part of the universe, and would consider each particle of blood, not as a part, but as a whole. He would be unable to determine how all the parts are modified by the general nature of blood, and are compelled by it to adapt themselves so as to stand in a fixed relation to one another. For if we imagine that there are no causes external to the blood, which could communicate fresh movements to it, nor any space beyond the blood, nor any bodies whereto the particles of blood could communicate their motion, it is certain that the blood would always remain in the same state, and its particles would undergo no modifications, save those which may be conceived as arising from the relations of motion existing between the lymph, the chyle, etc. The blood would then always have to be considered as a whole, not as a part. But as there exist, as a matter of fact, very many causes which modify, in a given manner, the nature of blood, and are, in turn, modified thereby, it follows that other motions and other relations arise in the blood, springing not from the mutual relations of its parts only, but from the mutual relations between the blood as a whole and external causes. Thus the blood comes to be regarded as a part, not as a whole. So much for the whole and the part.

All natural bodies can and ought to be considered in the same way as we have here considered the blood, for all bodies are surrounded by others, and are mutually determined to exist and operate in a fixed and definite proportion, while the relations between motion and rest in the sum total of them, that is, in the whole universe, remain unchanged. Hence it follows that each body, in so far as it exists as modified in a particular manner, must be considered as a part of the whole universe, as agreeing with the whole, and associated with the remaining parts. As the nature of the universe is not limited, like the nature of blood, but is absolutely infinite, its parts are by this nature of infinite power infinitely modified, and compelled to undergo infinite variations....

You see, therefore, how and why I think that the human body is a part of Nature. As regards the human mind, I believe that it also is a part of Nature; for I maintain that there exists in Nature an infinite power of thinking, which, in so far as it is infinite, contains subjectively the whole of Nature, and its thoughts proceed in the same manner as Nature—that is, in the sphere of ideas. Further, I take the human mind to be identical with this said power, not in so far as it is infinite, and perceives the whole of Nature, but in so far as it is finite, and perceives only the human body. In this manner, I maintain that the human mind is part of an infinite understanding.

The Nature of the Human Mind

The essence of man is formed by certain modes of the attributes of God, that is to say, modes of thought, the idea of all of them being prior by nature to the modes of thought themselves; and if this idea exists, other modes (which also have an idea in nature prior to them) must exist in the same individual likewise. Therefore an idea is the first thing which forms the Being of the human mind. But it is not the idea of a non-existent thing, for then the idea itself could not be said to exist. It will therefore be the idea of something actually existing. Neither will it be the idea of an infinite thing, for an infinite thing must always necessarily exist, and this is absurd. Therefore the first thing which forms the actual Being of the human mind is the idea of an individual thing actually existing.

The knowledge of everything which happens in the object of any idea necessarily exists in God, in so far as He is considered as modified by the idea of that object; that is to say, in so far as He forms the mind of any being. The knowledge, therefore, necessarily exists in God of everything which happens in the object of the idea constituting the human mind; that is to say, it exists in Him in so far as He forms the nature of the human mind; or, whatever happens in the object of the idea constituting the human mind must be perceived by the human mind; in other words, an idea of that thing will necessarily exist in the human mind. That is to say, if the object of the idea constituting the human mind be a body, nothing can happen in that body which is not perceived by the mind.

If the body were not the object of the human mind, the ideas of the modifications of the body would not be in God, in so far as He has formed our mind, but would be in Him in so far as He has formed the mind of another thing; that is to say, the ideas of the modifications of the body would not be in our mind. But we have ideas of the modifications of a body; therefore the object of the idea constituting the human mind is a body, and that, too, actually existing. Again, if there were also any other object of the mind besides a body, since nothing exists from which some effect does not follow, the idea of some effort produced by this object would necessarily exist in our mind. But there is no such idea. Therefore the object of the idea constituting the human mind is a body, or a certain mode of extension actually existing, and nothing else.

Hence it follows that man is composed of mind and body, and that the human body exists as we perceive it.

Hence we see not only that the human mind is united to the body, but also what is to be understood by the union of the mind and body. But no one can understand it adequately or distinctly without knowing adequately beforehand the nature of our body; for those things which we have proved hitherto are altogether general, nor do they refer more to man than to other individuals, all of which are animate, although in different degrees. For of everything there necessarily exists in God an idea of which He is the cause, in the same way as the idea of the human body exists in Him; and therefore everything that we have said of the idea of the human body is necessarily true of the idea of any other thing. We cannot, however, deny that ideas, like objects themselves, differ from one another, and that one is more excellent and contains more reality than another, just as the object of one idea is more excellent and contains more reality than another. Therefore, in order to determine the differences between the human mind and other things and its superiority over them, we must first know, as we have said, the nature of its object, that is to say, the nature of the human body. I am not able to explain it here, nor is such an explanation necessary for what I wish to demonstrate.

This much, nevertheless, I will say generally, that in proportion as one body is better adapted than another to do or suffer many things, in the same proportion will the mind at the same time be better adapted to perceive many things, and the more the actions of a body depend upon itself alone, and the less other bodies cooeperate with it in action, the better adapted will the mind be for distinctly understanding. We can thus determine the superiority of one mind to another; we can also see the reason why we have only a very confused knowledge of our body, together with many other things which I shall deduce in what follows.

The Complexity of the Human Mind

The idea which constitutes the formal Being of the human mind is the idea of a body which is composed of a number of individuals composite to a high degree. But an idea of each individual composing the body must necessarily exist in God; therefore the idea of the human body is composed of these several ideas of the component parts. The idea which constitutes the formal Being of the human mind is not simple, but is composed of a number of ideas.

All ways in which any body is affected follow at the same time from the nature of the affected body, and from the nature of the affecting body; therefore the idea of these modifications necessarily involves the nature of each body, and therefore the idea of each way in which the human body is affected by an external body involves the nature of the human body and of the external body.

Hence it follows, in the first place, that the human mind perceives the nature of many bodies together with that of its own body.

It follows, secondly, that the ideas we have of external bodies indicate the constitution of our own body rather than the nature of external bodies.

Imagination

If the human body be affected in a way which involves the nature of any external body, the human mind will contemplate that external body as actually existing or as present, until the human body be affected by a mode which excludes the existence or presence of the external body.

When external bodies so determine the fluid parts of the human body that they often strike upon the softer parts, the fluid parts change the plane of the soft parts, and thence it happens that the fluid parts are reflected from the new planes in a direction different from that in which they used to be reflected, and that also afterwards when they strike against these new planes by their own spontaneous motion, they are reflected in the same way as when they were impelled towards those planes by external bodies. Consequently those fluid bodies produce a modification in the human body while they keep up this reflex motion similar to that produced by the presence of an external body. The mind, therefore, will think as before, that is to say, it will again contemplate the external body as present. This will happen as often as the fluid parts of the human body strike against those planes by their own spontaneous motion. Therefore, although the external bodies by which the human body was once affected do not exist the mind will perceive them as if they were present so often as this action is repeated in the body.

We see, therefore, how it is possible for us to contemplate things which do not exist as if they were actually present. This may indeed be produced by other causes, but I am satisfied with having here shown one cause through which I could explain it, just as if I had explained it through the true cause. I do not think, however, that I am far from the truth, since no postulate which I have assumed contains anything which is not confirmed by an experience that we cannot mistrust, after we have proved the existence of the human body as we perceive it.

We clearly see, moreover, what is the difference between the idea, for example, of Peter, which constitutes the essence of the mind itself of Peter, and the idea of Peter himself which is in another man; for example, in Paul. For the former directly manifests the essence of the body of Peter himself, nor does it involve existence unless so long as Peter exists; the latter, on the other hand, indicates rather the constitution of the body of Paul than the nature of Peter; and therefore so long as Paul's body exists with that constitution, so long will Paul's mind contemplate Peter as present, although he does not exist. But in order that we may retain the customary phraseology, we will give to those modifications of the human body, the ideas of which represent to us external bodies as if they were present, the name of images of things, although they do not actually reproduce the forms of the things. When the mind contemplates bodies in this way, we will say that it imagines. Here I wish it to be observed, in order that I may begin to show what error is, that these imaginations of the mind, regarded by themselves, contain no error, and that the mind is not in error because it imagines, but only in so far as it is considered as wanting in an idea which excludes the existence of those things which it imagines as present. For if the mind, when it imagines non-existent things to be present, could at the same time know that those things did not really exist, it would think its power of imagination to be a virtue of its nature and not a defect, especially if this faculty of imagining depended upon its own nature alone, that is to say, if this faculty of the mind were free.

Association of Ideas and Memory

If the human body has at any time been simultaneously affected by two or more bodies, whenever the mind afterwards imagines one of them, it will also remember the others.

We clearly understand by this what memory is. It is nothing else than a certain concatenation of ideas, involving the nature of things which are outside the human body, a concatenation which corresponds in the mind to the order and concatenation of the modifications of the human body. I say, firstly, that it is a concatenation of those ideas only which involve the nature of things which are outside the human body, and not of those ideas which explain the nature of those things, for there are in truth ideas of the modifications of the human body, which involve its nature as well as the nature of external bodies. I say, in the second place, that this concatenation takes place according to the order and concatenation of the modifications of the human body, that I may distinguish it from the concatenation of ideas which takes place according to the order of the intellect, and enables the mind to perceive things through their first causes, and is the same in all men.

Hence we can clearly understand how it is that the mind from the thought of one thing at once turns to the thought of another thing which is not in any way like the first. For example, from the thought of the word pomum a Roman immediately turned to the thought of the fruit, which has no resemblance to the articulate sound pomum, nor anything in common with it, excepting this, that the body of that man was often affected by the thing and the sound; that is to say, he often heard the word pomum when he saw the fruit. In this manner each person will turn from one thought to another according to the manner in which the habit of each has arranged the images of things in the body. The soldier, for instance, if he sees the footsteps of a horse in the sand, will immediately turn from the thought of a horse to the thought of a horseman, and so to the thought of war. The countryman, on the other hand, from the thought of a horse will turn to the thought of his plow, his field, etc.; and thus each person will turn from one thought to this or that thought, according to the manner in which he has been accustomed to connect and bind together the images of things in his mind.

FOOTNOTES:

[14] [Similarly, it can be demonstrated that] extension is an attribute of God, or God is an extended thing.

[15] Chapter Eight.

[16] The formal Being of things which are not modes of thought does not follow from the divine nature because of His prior knowledge of these things, but, just as ideas follow from the attribute of thought, in the same manner and with the same necessity the objects of ideas follow and are concluded from their attributes.

[17] From a letter to Henry Oldenburg (1665).



CHAPTER X

THE NATURE AND EXTENT OF HUMAN KNOWLEDGE

Of Truth

All the ideas which are in God always agree with those things of which they are the ideas. Therefore, all ideas, in so far as they are related to God, are true.

A true idea[18] (for we possess a true idea) is something different from its correlate (ideatum); thus a circle is different from the idea of a circle. The idea of a circle is not something having a circumference and a center, as a circle has; nor is the idea of a body that body itself. Now, as it is something different from its correlate, it is capable of being understood through itself; in other words, the idea, in so far as its actual essence (essentia formalis) is concerned, may be the subject of another subjective essence. And, again, this second subjective essence will, regarded in itself, be something real and capable of being understood; and so on indefinitely. For instance, the man Peter is something real; the true idea of Peter is the reality of Peter represented subjectively, and is in itself something real, and quite distinct from the actual Peter. Now, as this true idea of Peter is in itself something real, and has its own individual existence, it will also be capable of being understood—that is, of being the subject of another idea which will contain by representation all that the idea of Peter contains actually. And, again, this idea of the idea of Peter has its own individuality, which may become the subject of yet another idea; and so on indefinitely. This every one may make trial of for himself, by reflecting that he knows what Peter is, and also knows that he knows, and further knows that he knows that he knows, etc. Hence, it is plain that, in order to understand the actual Peter, it is not necessary first to understand the idea of Peter, and still less the idea of the idea of Peter. This is the same as saying that in order to know, there is no need to know that we know, much less to know that we know that we know. This is no more necessary than to know the nature of a circle before knowing the nature of a triangle. But with these ideas the contrary is the case; for in order to know that I know, I must first know. Hence it is clear that certainty is nothing else than the subjective essence of a thing: in other words, the mode in which we perceive an actual reality is certainty. Further, it is also evident that for the certitude of truth no further sign is necessary beyond the possession of a true idea; for, as I have shown, it is not necessary to know that we know that we know....

He who has a true idea knows at the same time that he has a true idea, nor can he doubt the truth of the thing. For no one who has a true idea is ignorant that a true idea involves the highest certitude; to have a true idea signifying just this, to know a thing perfectly or as well as possible. No one, in fact, can doubt this, unless he supposes an idea to be something dumb, like a picture on a tablet, instead of being a mode of thought, that is to say, intelligence itself. Moreover, I ask who can know that he understands a thing unless he first of all understands that thing? that is to say, who can know that he is certain of anything unless he is first of all certain of that thing? Then, again, what can be clearer or more certain than a true idea as the standard of truth? Just as light reveals both itself and the darkness, so truth is the standard of itself and of the false.

Of Falsity

There is nothing positive in ideas which can constitute a form of falsity. But falsity cannot consist in absolute privation (for we say that minds and not bodies err and are mistaken); nor can it consist in absolute ignorance, for to be ignorant and to be in error are different. Falsehood, therefore, consists in the privation of knowledge which is involved by inadequate knowledge of things or by inadequate and confused ideas. For instance, men are deceived because they think themselves free, and the sole reason for thinking so is that they are conscious of their own actions, and ignorant of the causes by which those actions are determined. Their idea of liberty therefore is this—that they know no cause for their own actions; for as to saying that their actions depend upon their will, these are words to which no idea is attached. What the will is, and in what manner it moves the body, every one is ignorant, for those who pretend otherwise, and devise seats and dwelling-places of the soul, usually excite our laughter or disgust. Just in the same manner, when we look at the sun, we imagine its distance from us to be about 200 feet; the error not consisting solely in the imagination, but arising from our not knowing what the true distance is when we imagine, and what are the causes of our imagination. For although we may afterwards know that the sun is more than 600 diameters of the earth distant from us, we still imagine it near us, since we imagine it to be so near, not because we are ignorant of its true distance, but because a modification of our body involves the essence of the sun, in so far as our body itself is affected by it.

The Origin and Nature of Confused Ideas

The ideas of the modifications of the human body involve the nature both of external bodies and of the human body itself and must involve the nature not only of the human body, but of its parts, for the modifications are ways in which the parts of the human body, and consequently the whole body, are affected. But an adequate knowledge of external bodies and of the parts composing the human body does not exist in God in so far as He is considered as affected by the human mind, but in so far as He is affected by other ideas. These ideas of modifications, therefore, in so far as they are related to the human mind alone, are like conclusions without premises, that is to say, as is self-evident, they are confused ideas.

The idea which forms the nature of the mind is demonstrated in the same way not to be clear and distinct when considered in itself. So also with the idea of the human mind, and the ideas of the ideas of the modifications of the human body, in so far as they are related to the mind alone, as every one may easily see.

All ideas are in God and in so far as they are related to God are true and adequate. No ideas, therefore, are inadequate or confused unless in so far as they are related to the individual mind of some person. All ideas, therefore, both adequate and inadequate, follow by the same necessity.

The Origin and Nature of Adequate Ideas

Let there be something, A, which is common to all bodies, and which is equally in the part of each body and in the whole. I say that A can only be adequately conceived. For the idea of A will necessarily be adequate in God, both in so far as He has the idea of the human body and in so far as He has the idea of its modifications, which involve the nature of the human body, and partly also the nature of external bodies; that is to say, this idea will necessarily be adequate in God in so far as He constitutes the human mind, or in so far as He has ideas which are in the human mind. The mind, therefore, necessarily perceives A adequately, both in so far as it perceives itself or its own or any external body; nor can A be conceived in any other manner.

Hence it follows that some ideas or notions exist which are common to all men, for all bodies agree in some things, which must be adequately, that is to say, clearly and distinctly, perceived by all.

Hence it follows also that the more things the body has in common with other bodies, the more things will the mind be adapted to perceive.

Those ideas are also adequate which follow in the mind from ideas which are adequate in it. For when we say that an idea follows in the human mind from ideas which are adequate in it, we do but say that in the divine intellect itself an idea exists of which God is the cause, not in so far as He is infinite, nor in so far as He is affected by the ideas of a multitude of individual things, but in so far only as He constitutes the essence of the human mind.

I have thus explained the origin of those notions which are called common, and which are the foundations of our reasoning; but of some axioms or notions other causes exist which it would be advantageous to explain by our method, for we should thus be able to distinguish those notions which are more useful than others, and those which are scarcely of any use; those which are common; those which are clear and distinct only to those persons who do not suffer from prejudice; and, finally, those which are ill-founded. Moreover, it would be manifest whence these notions which are called second, and consequently the axioms founded upon them, have taken their origin, and other things, too, would be explained which I have thought about at different times. Since, however, I have set apart this subject for another treatise, and because I do not wish to create disgust with excessive prolixity, I have determined to pass by these matters here.