Distinction of true ideas from fictitious ideas

Let us then make a beginning with the first part of the method, which is, as we have said, to distinguish and separate the true idea from other perceptions, and to keep the mind from confusing with true ideas those which are false, fictitious, and doubtful. I intend to dwell on this point at length, partly to keep a distinction so necessary before the reader’s mind, and also because there are some who doubt of true ideas, through not having attended to the distinction between a true perception and all others. Such persons are like men who, while they are awake, doubt not that they are awake, but afterwards in a dream, as often happens, thinking that they are surely awake, and then finding that they were in error, become doubtful even of being awake. This state of mind arises through neglect of the distinction between sleeping and waking.

Meanwhile, I give warning that I shall not here give essence of every perception, and explain it through its proximate cause. Such work lies in the province of philosophy. I shall confine myself to what concerns method — that is, to the character of fictitious, false and doubtful perceptions, and the means of freeing ourselves therefrom. Let us then first inquire into the nature of a fictitious idea.

Every perception has for its object either a thing considered as existing, or solely the essence of a thing. Now “fiction” is chiefly occupied with things considered as existing. I will, therefore, consider these first — I mean cases where only the existence of an object is feigned, and the thing thus feigned is understood, or assumed to be understood. For instance, I feign that Peter, whom I know to have gone home, is gone to see me 17 or something of that kind. With what is such an idea concerned? It is concerned with things possible, and not with things necessary or impossible.

I call a thing impossible when its existence would imply a contradiction; necessary, when its non-existence would imply a contradiction; possible, when neither its existence nor its non-existence imply a contradiction, but when the necessity or impossibility of its nature depends on causes unknown to us, while we feign that it exists. If the necessity or impossibility of its existence depending on external causes were known to us, we could not form any fictitious hypotheses about it;

Whence it follows that if there be a God, or omniscient Being, such an one cannot form fictitious hypotheses. For, as regards ourselves, when I know that I exist 18 I cannot hypothesize that I exist or do not exist, any more than I can hypothesize an elephant that can go through the eye of a needle; nor when I know the nature of God, can I hypothesize that He or does not exist. 19 The same thing must be said of the Chimaera, whereof the nature implies a contradiction. From these considerations, it is plain, as I have already stated, that fiction cannot be concerned with eternal truths. 20

But before proceeding further, I must remark, in passing, that the difference between the essence of one thing and the essence of another thing is the same as that which exists between the reality or existence of one thing and the reality or existence of another; therefore, if we wished to conceive the existence, for example, of Adam, simply by means of existence in general, it would be the same as if, in order to conceive his existence, we went back to the nature of being, so as to define Adam as a being. Thus, the more existence is conceived generally, the more is it conceived confusedly and the more easily can it be ascribed to a given object. Contrariwise, the more it is conceived particularly, the more is it understood clearly, and the less liable is it to be ascribed, through negligence of Nature’s order, to anything save its proper object. This is worthy of remark.

We now proceed to consider those cases which are commonly called fictions, though we clearly understood that the thing is not as we imagine it. For instance, I know that the earth is round, but nothing prevents my telling people that it is a hemisphere, and that it is like a half apple carved in relief on a dish; or, that the sun moves round the earth, and so on. However, examination will show us that there is nothing here inconsistent with what has been said, provided we first admit that we may have made mistakes, and be now conscious of them; and, further, that we can hypothesize, or at least suppose, that others are under the same mistake as ourselves, or can, like us, fall under it. We can, I repeat, thus hypothesize so long as we see no impossibility. Thus, when I tell anyone that the earth is not round, &c., I merely recall the error which I perhaps made myself, or which I might have fallen into, and afterwards I hypothesize that the person to whom I tell it, is still, or may still fall under the same mistake. This I say, I can feign so long as I do not perceive any impossibility or necessity; if I truly understood either one or the other I should not be able to feign, and I should be reduced to saying that I had made the attempt.

It remains for us to consider hypotheses made in problems, which sometimes involve impossibilities. For instance, when we say — let us assume that this burning candle is not burning, or, let us assume that it burns in some imaginary space, or where there are no physical objects. Such assumptions are freely made, though the last is clearly seen to be impossible. But, though this be so, there is no fiction in the case. For, in the first case, I have merely recalled to memory 21 another candle not burning, or conceived the candle before me as without a flame, and then I understand as applying to the latter, leaving its flame out of the question, all that I think of the former. In the second case, I have merely to abstract my thoughts from the objects surrounding the candle, for the mind to devote itself to the contemplation of the candle singly looked at in itself only; I can then draw the conclusion that the candle contains in itself no causes for its own destruction, so that if there were no physical objects the candle, and even the flame, would remain unchangeable, and so on. Thus there is here no fiction, but 22 true and bare assertions.

Let us now pass on to the fictions concerned with essences only, or with some reality or existence simultaneously. Of these we must specially observe that in proportion as the mind’s understanding is smaller, and its experience multiplex, so will its power of coining fictions be larger, whereas as its understanding increases, its capacity for entertaining fictitious ideas becomes less. For instance, in the same way as we are unable, while we are thinking, to feign that we are thinking or not thinking, so, also, when we know the nature of body we cannot imagine an infinite fly; or, when we know the nature of the soul 23 we cannot imagine it as square, though anything may be expressed verbally. But, as we said above, the less men know of nature the more easily can they coin fictitious ideas, such as trees speaking, men instantly changed into stones, or into fountains, ghosts appearing in mirrors, something issuing from nothing, even gods changed into beasts and men and infinite other absurdities of the same kind.

Some persons think, perhaps, that fiction is limited by fiction, and not by understanding; in other words, after I have formed some fictitious idea, and have affirmed of my own free will that it exists under a certain form in nature, I am thereby precluded from thinking of it under any other form. For instance, when I have feigned (to repeat their argument) that the nature of body is of a certain kind, and have of my own free will desired to convince myself that it actually exists under this form, I am no longer able to hypothesize that a fly, for example, is infinite; so, when I have hypothesized the essence of the soul, I am not able to think of it as square, &c.

But these arguments demand further inquiry. First, their upholders must either grant or deny that we can understand anything. If they grant it, then necessarily the same must be said of understanding, as is said of fiction. If they deny it, let us, who know that we do know something, see what they mean. They assert that the soul can be conscious of, and perceive in a variety of ways, not itself nor things which exist, but only things which are neither in itself nor anywhere else, in other words, that the soul can, by its unaided power, create sensations or ideas unconnected with things. In fact, they regard the soul as a sort of god. Further, they assert that we or our soul have such freedom that we can constrain ourselves, or our soul, or even our soul’s freedom. For, after it has formed a fictitious idea, and has given its assent thereto, it cannot think or feign it in any other manner, but is constrained by the first fictitious idea to keep all its other thoughts in harmony therewith. Our opponents are thus driven to admit, in support of their fiction, the absurdities which I have just enumerated; and which are not worthy of rational refutation.

While leaving such persons in their error, we will take care to derive from our argument with them a truth serviceable for our purpose, namely 24 that the mind, in paying attention to a thing hypothetical or false, so as to meditate upon it and understand it, and derive the proper conclusions in due order therefrom, will readily discover its falsity; and if the thing hypothetical be in its nature true, and the mind pays attention to it, so as to understand it, and deduce the truths which are derivable from it, the mind will proceed with an uninterrupted series of apt conclusions; in the same way as it would at once discover (as we showed just now) the absurdity of a false hypothesis, and of the conclusions drawn from it.

We need, therefore, be in no fear of forming hypotheses, so long as we have a clear and distinct perception of what is involved. For, if we were to assert, haply, that men are suddenly turned into beasts, the statement would be extremely general, so general that there would be no conception, that is, no idea or connection of subject and predicate, in our mind. If there were such a conception we should at the same time be aware of the means and the causes whereby the event took place. Moreover, we pay no attention to the nature of the subject and the predicate.

Now, if the first idea be not fictitious, and if all the other ideas be deduced therefrom, our hurry to form fictitious ideas will gradually subside. Further, as a fictitious idea cannot be clear and distinct, but is necessarily confused, and as all confusion arises from the fact that the mind has only partial knowledge of a thing either simple or complex, and does not distinguish between the known and the unknown, and, again, that it directs its attention promiscuously to all parts of an object at once without making distinctions, it follows, first, that if the idea be of something very simple, it must necessarily be clear and distinct. For a very simple object cannot be known in part, it must either be known altogether or not at all.

17 See below the note on hypotheses, whereof we have a clear understanding; the fiction consists in saying that such hypotheses exist in heavenly bodies.

18 As a thing, when once it is understood, manifests itself, we have need only of an example without further proof. In the same way the contrary has only to be presented to our minds to be recognized as false, as will forthwith appear when we come to discuss fiction concerning essences.

19 Observe, that although many assert that they doubt whether God exists, they have nought but his name in their minds, or else some fiction which they call God: this fiction is not in harmony with God’s real nature, as we will duly show.

20 I shall presently show that no fiction can concern eternal truths. By an eternal truth, I mean that which being positive could never become negative. Thus it is a primary and eternal truth that God exists, but it is not an eternal truth that Adam thinks. That the Chimaera does not exist is an eternal truth, that Adam does not think is not so.

21 Afterwards, when we come to speak of fiction that is concerned with essences, it will be evident that fiction never creates or furnishes the mind with anything new; only such things as are already in the brain or imagination are recalled to the memory, when the attention is directed to them confusedly and all at once. For instance, we have remembrance of spoken words and of a tree; when the mind directs itself to them confusedly, it forms the notion of a tree speaking. The same may be said of existence, especially when it is conceived quite generally as an entity; it is then readily applied to all things together in the memory. This is specially worthy of remark.

22 We must understand as much in the case of hypotheses put forward to explain certain movements accompanying celestial phenomena; but from these, when applied to the celestial motions, we any draw conclusions as to the nature of the heavens, whereas this last may be quite different, especially as many other causes are conceivable which would account for such motions.

23 It often happens that a man recalls to mind this word soul, and forms at the same time some corporeal image: as the two representations are simultaneous, he easily thinks that he imagines and feigns a corporeal soul: thus confusing the name with the thing itself. I here beg that my readers will not be in a hurry to refute this proposition; they will, I hope, have no mind to do so, if they pay close attention to the examples given and to what follows.

24 Though I seem to deduce this from experience, some may deny its cogency because I have given no formal proof. I therefore append the following for those who may desire it. As there can be nothing in nature contrary to nature’s laws, since all things come to pass by fixed laws, so that each thing must irrefragably produce its own proper effect, it follows that the soul, as soon as it possesses the true conception of a thing, proceeds to reproduce in thought that thing’s effects. See below, where I speak of the false idea.
And from false ideas

Secondly, it follows that if a complex object be divided by thought into a number of simple component parts, and if each be regarded separately, all confusion will disappear. Thirdly, it follows that fiction cannot be simple, but is made up of the blending of several confused ideas of diverse objects or actions existent in nature, or rather is composed of attention directed to all such ideas at once 25 and unaccompanied by any mental assent. Now a fiction that was simple would be clear and distinct, and therefore true, also a fiction composed only of distinct ideas would be clear and distinct, and therefore true. For instance, when we know the nature of the circle and the square, it is impossible for us to blend together these two figures, and to hypothesize a square circle, any more than a square soul, or things of that kind.

Let us shortly come to our conclusion, and again repeat that we need have no fear of confusing with true ideas that which is only a fiction. As for the first sort of fiction of which we have already spoken, when a thing is clearly conceived, we saw that if the existence of a that thing is in itself an eternal trut fiction can have no part in it; but if the existence of the conceived be not an eternal truth, we have only to be careful such existence be compared to the thing’s essence, and to consider the order of nature. As for the second sort of fiction, which we stated to be the result of simultaneously directing the attention, without the assent of the intellect, to different confused ideas representing different things and actions existing in nature, we have seen that an absolutely simple thing cannot be feigned, but must be understood, and that a complex thing is in the same case if we regard separately the simple parts whereof it is composed; we shall not even be able to hypothesize any untrue action concerning such objects, for we shall be obliged to consider at the same time the causes and manner of such action.

These matters being thus understood, let us pass on to consider the false idea, observing the objects with which it is concerned, and the means of guarding ourselves from falling into false perceptions. Neither of these tasks will present much difficulty, after our inquiry concerning fictitious ideas. The false idea only differs from the fictitious idea in the fact of implying a mental assent — that is, as we have already remarked, while the representations are occurring, there are no causes present to us, wherefrom, as in fiction, we can conclude that such representations do not arise from external objects: in fact, it is much the same as dreaming with our eyes open, or while awake. Thus, a false idea is concerned with, or (to speak more correctly) is attributable to, the existence of a thing whereof the essence is known, or the essence itself, in the same way as a fictitious idea.

If attributable to the existence of the thing, it is corrected in the same way as a fictitious idea under similar circumstances. If attributable to the essence, it is likewise corrected in the same way as a fictitious idea. For if the nature of the thing known implies necessary existence, we cannot possible be in error with regard to its existence; but if the nature of the thing be not an eternal truth, like its essence, but contrariwise the necessity or impossibility of its existence depends on external causes, then we must follow the same course as we adopted in the of fiction, for it is corrected in the same manner.

As for false ideas concerned with essences, or even with actions, such perceptions are necessarily always confused, being compounded of different confused perceptions of things existing in nature, as, for instance, when men are persuaded that deities are present in woods, in statues, in brute beasts, and the like; that there are bodies which, by their composition alone, give rise to intellect; that corpses reason, walk about, and speak; that God is deceived, and so on. But ideas which are clear and distinct can never be false: for ideas of things clearly and distinctly conceived are either very simple themselves, or are compounded from very simple ideas, that is, are deduced therefrom. The impossibility of a very simple idea being false is evident to everyone who understands the nature of truth or understanding and of falsehood.

As regards that which constitutes the reality of truth, it is certain that a true idea is distinguished from a false one, not so much by its extrinsic object as by its intrinsic nature. If an architect conceives a building properly constructed, though such a building may never have existed, and amy never exist, nevertheless the idea is true; and the idea remains th............