Matter and Memory, Of the Survival of Images
(144) We have shown the the objects which surround us represent, in varying degrees, an action which we can accomplish upon things or which we must experience from them. The date of fulfillment of this possible action is indicated by the greater or lesser remoteness of the corresponding object, so that distance in space measure the proximity of a threat or of a promise in time. Thus space furnishes us at once with the diagram of our near future, and, as this future must recede indefinitely, space which symbolizes it has for its property to remain, in its immobility, indefinitely open. Hence the immediate horizon given to our perception appears to us to be necessarily surrounded by a wider circle, existing though unperceived, this circle itself implying yet another outside it and so on, ad infinitum. It is, then, of the essence of our actual perception, inasmuch as it is extended, to be always only a content in relation to a vaster, even an unlimited, experience which contains it; this experience, absent from our consciousness, since it spreads beyond the perceived horizon, nevertheless, appears to be actually given. But while we feel ourselves to be dependent upon these material objects which we thus erect into present real (145) cities, our memories, on the contrary, inasmuch as they are past, as so much dead weight that we carry with us, and by which we prefer to imagine ourselves unencumbered. The same instinct, in virtue of which we open out space indefinitely before us, prompts us to shut off time behind us as it flows. And while reality, in so far as it is extended, appears to us to overpass infinitely the bounds of our perception, in our inner life that alone seems to us to be real which begins with the present moment; the rest is practically abolished. Then, when a memory reappears in consciousness, it produces on us the effect of a ghost whose mysterious apparition must be explained by special causes. In truth, the adherence of this memory to our present condition is exactly comparable to the adherence of perceived objects to those objects which we perceive; and the unconscious plays in each case a similar part.
But we have great difficulty in representing the matter to ourselves in this way because we have fallen into the habit of emphasizing the differences and, on the contrary, of slurring over the resemblances, between the series of objects simultaneously set out in space and that of states successively developed in time. In the first, the terms condition each other in a manner which is entirely determined, so that the appearance of each new term may be foreseen. Thus I know, when I leave my room, what other rooms I shall go through. However, my memories present themselves in an order which is apparently capricious. The order of the representations is then necessary in the one case, contingent in the other; it is this necessity which I hypostatize, as it were, when I speak of the existence of objects outside of all consciousness. If I see no inconvenience in supposing, given the totality of objects which I do not perceive, it is because the strictly determined order of these objects lends to them the appearance of a chain, of which my present perception is only one link. This link communicates its actuality to the rest of the chain. But, if we look at the matter closely, (146) we shall see that our memories form a chain of the same kind, and that our character, always present in all our decisions, is indeed the actual synthesis of all our past states. In this epitomized form our previous psychical life exists for us even more than the external world, of which we never perceive more than a very small part, whereas, on the contrary, we use the whole of our lived experience. It is true that we posses merely a digest of it, and that our former perceptions, considered as distinct individualities, seem to us to have completely disappeared or to appear again only at the bidding of their caprice. But this semblance of complete destruction or of capricious revival is due merely to the fact that actual consciousness accepts at each moment the useful and rejects in the same breath the superfluous. Ever bent upon action, it can only materialize those of our former perceptions which can ally themselves with the present perception to take a share in the final decision. If it is necessary, when I would manifest my will at a given point of space, that my consciousness should go successively through those intermediaries or those obstacles of which the sum constitutes what we call distance in space, so, on the other hand, it is useful, in order to throw light upon this action, that my consciousness should jump the interval of time which separates the actual situation from a former one which resembles it; and as consciousness goes back to the earlier date at a bound, all the intermediate past escapes its hold. The same reasons, then, which cause our perceptions to range themselves in strict continuity in space, cause our memories to be illumined discontinuously in time. We have not, in regard to objects unperceived in space and conscious memories in time, to do with two radically different forms of existence, but the exigencies of action are the inverse in the one case of what they are in the other.Â
But here we come to the capital problem of existence, a problem we can only glance at, for otherwise it would lead us step by (147) step into the heart of metaphysics. We will merely say that with regard to matters of experience -- which alone concern us here -- existence appears to imply two conditions taken together: (1) presentation in consciousness and (2) the logical or casual connection of that which is so presented with what precedes and with what follows. The reality for us of a psychical state or of a material object consists in the double fact that our consciousness perceives them and that they form part of a series, temporal or spatial, of which the elements determine each other. But these two conditions admit of degrees, and it is conceivable that, though both are necessary, they may unequally fulfilled. Thus, in the case of actual internal states, the connection is less close, and the determination of the present by the past, leaving ample room for contingency, has not the character of a mathematical deviation -- but then, presentation in consciousness is perfect, an actual psychical state yielding the whole of its content in the act itself, whereby we perceive it. On the contrary, if we are dealing with external objects it is the connection which is perfect, since these objects obey necessary laws; but then the other condition, presentation in consciousness, is never more than partially fulfilled, for the material object, just because of the multitude of unperceived elements by which it is linked with all other objects, appears to enfold within itself and to hide behind it infinitely more than it allows to be seen. We ought to say, then, that existence, in the empirical sense of the word, always implies conscious apprehension and regular connection; both at the same time, although in different degrees. But our intellect, of which the function is to establish clear-cut distinctions, does not so understand things. Rather than admit the presence in all cases of the two elements mingled in varying proportions, it prefers to dissociate them, and thus attribute to external objects, on the one hand, and to internal states, on the other hand, two radically difference modes of exis-(148) tence, each characterized by the exclusive presence of the condition which should be regarded as merely preponderating. Then the existence of the psychical states is issued to consist entirely in the apprehension by consciousness, and that of external phenomena, entirely also, in the strict order of their concomitance and their succession. Whence the impossibility of leaving to material objects, existing, but unperceived, the smallest share in consciousness, and to internal unconscious states the smallest share in existence. We have shown, at the beginning of this book, the consequences of the first illusion: it ends by falsifying our representation of matter. The second illusion, complementary to the first, vitiates our conception of mind by casting over the idea of the unconscious an artificial obscurity. The whole of our past psychical life conditions our present state, without being its necessary determinant; whole, also, it reveals itself in our character, although none of its past states manifests itself explicitly in character. Taken together, these two conditions assure to each one of the past psychological states a real, though an unconscious, existence.Â
But we are so accustomed to reverse, for the sake of action, the real order of things, we are so strongly obsessed by images drawn from space, that we cannot hinder ourselves from asking where memories are stored up. We understand that physics-chemical phenomena take place in the brain, that the brain is in the body, the body in the air which surrounds it, etc.; but the past, once achieved, if it is retained, where is it? To locate it in the cerebral substance, in the state of molecular modification, seems clear and simple enough because then we have a receptacle, actually given, which we have only to open in order to let the latent images flow into consciousness. But if the brain cannot serve such a purpose, in what warehouse shall we store the accumulated images? We forget that the relation of container to content borrows its apparent clearness and universality from the necessity laid (149) upon us of always opening out space in front of us and of always closing duration behind us. Because it has been shown that one thing is within another, the phenomenon of its preservation is not thereby made any clearer. We may even go further: let us admit for a moment that the past survives in the form of a memory stored in the brain; it is then necessary that the brain, in order to preserve the memory, should preserve itself. But the brain, insofar as it is an image extended in space, never occupies more than the present moment: it constitutes, with all the rest of the material universe, an ever-renewed section of universal becoming. Either, then, you must suppose that this universe dies and is born again miraculously at each moment of duration, or you must attribute to it that continuity of existence which you deny to consciousness, and make of its past a reality which endures and is prolonged into its present. So that you have gained nothing by depositing the memories in matter, and you find yourself, on the contrary, compelled to extend to the totality of the states of the material world that complete and independent survival of the past which you have just refused to psychical states. This survival of the past per se forces itself upon philosophers, then, under one form or another; the difficulty that we have in conceiving it comes simply from the fact that we extend to the series of memories, in time, that obligation of containing and being contained which applies only to the collection of bodies instantaneously perceived in space. The fundamental illusion consists in transferring to duration itself, in its continuous flow, the form of the instantaneous sections which we make in it.
But how can the past, which, by hypothesis, has ceased to be, preserve itself? Have we not here a real contradiction? We reply that the question is just whether the past has ceased to exist or whether it has simply ceased to be useful. You define the present in an arbitrary manner as that which is, whereas the present is sim-(150)ply what is being made. Nothing is less than the present moment, if you understand by that the indivisible limit which divides the past from the future. When we think this present is going to be, it exists not yet, and when we think it as existing, it is already past. If, on the other hand, what you are considering is the concrete present such as it is actually lived by consciousness, we may say that this present consists, in large measure, in the immediate past. In the fraction of a second which covers the briefest possible perception of light, billions of vibrations have taken place, of which the first is separated from the last by an interval which is enormously divided. Your perception, however instantaneous, consists then in an incalculable multitude of remembered elements; in truth, every perception is already memory. Practically, we perceive only the past, the pure present being the invisible progress of the past gnawing into the future.
Consciousness, then, illumines, at each moment of time, that immediate part of the past which, impending over the future, seeks to realize and to associate with it. Solely preoccupied in thus determining an undetermined future, consciousness may shed a little of its light on those of our sites, more remote in the past, which can be usefully combined with our present state, that is to say, with our immediate past: the rest remains in the dark. It is in this illuminated part of our history that we remain seated, in virtue of the fundamental law of life, which is a law of action: hence the difficulty we experience in conceiving memories which are preserved in the shadow. Our reluctance to admit the integral survival of the past has its origin, then, in the very bent of our psychical life -- an unfolding of states wherein our interest prompts us to look at that which is unrolling, and not at that which is entirely unrolled.Â
So we return, after a long digression, to our point of departure. There are, we have said, two memories which are profoundly (151) distinct: the one, fixed in the organism, is nothing else but the complete set of intelligently constructed mechanisms which ensure the appropriate reply to the various possible demands. This memory enables us to adapt ourselves to the present situation; through it the actions to which we are subject prolong themselves into reactions that are sometimes accomplished, sometimes merely nascent, but always more ore less appropriate. Habit rather than memory, it acts our past experience but does not call up its image. The other is the true memory. Coextensive with consciousness, it retains and ranges alongside of each other all our states in the order in which they occur, leaving to each fact its place and, consequently, marking its date, truly moving in the past and not, like the first, in an ever renewed present. But, in marking the profound distinction between these two forms of memory, we have not shown their connecting link. Above the body, with its mechanisms which symbolize the accumulated effort of past actions, the memory which imagines and repeats has been left to hang, as it were, suspended in the void. Now, if it be true that we never perceive anything but our immediate past, if our consciousness of the present is already memory, the two terms which had been separated to begin with cohere closely together. Seen from this new point of view, indeed, our body is nothing but that part of our representation which is ever being born again, the part always present, or rather that which, at each moment, is just past. Itself an image, the body cannot store up images, since it forms a part of the images, and this is why it is a chimerical enterprise to seek to localize past or even present perceptions in the brain: they are not in it; it is the brain that is in them. But this special image which persists in the midst of the others, and which I call my body, constitutes at every moment, as we have said, a section of the universal becoming. It is then the place of passage of the movements received and thrown back, a hyphen, a connecting link between the things which act upon me (152) and the things upon which I act  --Â