Bergson's theory of personality arises naturally out of his conception of time. Time is said to have one dimension. Yes, if we symbolize it by a line; otherwise not, it has no dimension. The impersonal time of the philosophers and scientists is merely the spatial symbol of duration. What our experience shows us is not this empty artificial uneventful time, but duration. And not merely duration, but durations, for there are as many durations of different interval rhythm as there are consciousnesses. This is what is real in time. Time is really the continuous unrolling of our conscious life, of psychologic states which do not become distinct except when it pleases us to divide them. Personality is a continuity of indivisible movement. We can draw a bucket of water out of the river, and then another bucketful, but we can never get the stream in this way, for the stream is essentially movement. The movement is what is substantial about the stream.
From immobile states we can never make of life what experience actually gives us, for life is change. Only by seizing this change directly in an integral experience can we solve the problem. To true realities no concept is applicable. Reality must be regarded itself, in itself, just as it is; and in giving a description of it, we can fix only the image of it before our eyes.
The guiding thread of philosophical problems is that the intellect is an instrument of action which has developed itself in the course of centuries in order to triumph over the difficulties that matter opposes to life. The intellect has constituted itself for the purpose of a battle. The obstacles which it would overthrow are those of brute matter. The categories of the understanding are constructed with a view of action upon matter. So where our intellect seeks to know something else than the material world, it finds itself unable to grasp it. The whole history of the evolution of life combines to show that intelligence is an instrumental function for action upon matter, to formulate and present the laws which permit us to foresee, and therefore to forestall.
In dealing with a reality like personality, the intellect will first attempt to handle the subject with the same processes that it employs for inert matter, therefore it ends in a logical impasse. This is the origin of the difficulties of the question. The concepts which it would apply to personality are made only for the material world. We do not know how to apply them adequately to the life of the mind, which overflows them.
To direct our attention upon the stream of our consciousness breaks it up and immobilizes it. But it may be reached by another kind of introspection, which consists in letting live, in trying to reënforce vitality. In this way activity may become consciousness without ceasing to be active. Thus the ego may be seized as it really is, as a transition and a continuity.
In his theory of evolution Bergson draws a sharp distinction between intelligence and instinct. As intelligence has reached its highest point in the human race, so instinct has reached its highest point in the ants, bees, and wasps. Here we see instinct attaining its ends by the employment of the most varied and complicated expedients. The ant is lord of the subsoil as man is lord of the soil. The solitary wasps, whom Maeterlinck would despise as primitive individualists in comparison with the socialized bees, are used by Bergson to illustrate his theory of instinct. These insects provide for the future needs of their larvæ by storing up in their underground nest spiders, beetles, or caterpillars. These are to be kept alive, as we keep turtles and lobsters, so they will be fresh, and in order to prevent them from escaping, the wasp paralyzes them by stinging them at the point or points where the motor nerves meet. One species of wasp pierces the ganglia of its caterpillar by nine successive thrusts of its sting and then squeezes the head in its mandibles, enough to cause paralysis without death. Other kinds of wasps have to use other forms of surgical treatment, according to the kind of insect they put into storage. How can this be explained? If we call it intelligence, we must assume that the wasp or its ancestors has been endowed with a knowledge of insect anatomy such as we hesitate to credit to any being lower in the scale of life than a professor of entomology. If we adopt a mechanistic hypothesis, we must assume that this marvelous skill in surgery has been gradually acquired in the course of thousands of generations, either by the survival of the descendants of those insects who happened to have stuck their stings into the nine right places (Darwinism), or by the inheritance of the acquired habit of stinging a certain species of caterpillar in that particular way (Lamarckianism). But since this knowledge or skill is never of use to the individual insect and is of no use to the species until it has arrived at a considerable degree of perfection, we can hardly adopt either theory without straining our imagination.
But the assumed difficulties vanish if we adopt the Bergsonian point of view and regard the caterpillar and wasp as two parts of the same process. It is no wonder then that they are fitted together. Slayer and slain have developed for that purpose, and what is apparently antagonism is really cooperation. The importance of this theory to those who are troubled about the moral interpretation of the universe is obvious, for the stinging of the caterpillar would seem something like picking a sliver out of the left hand by the right, but Bergson does not go into this question at all.
The formation of the eye, which is the source of much perplexity to evolutionists of all schools, provides Bergson with an excellent illustration of his theory. The eye of mollusks is similar in form and identical in function with the eye of the vertebrates, yet the two are composed of different elements and grow in a different way. The retina of the vertebrate is produced by an expansion of the central nervous system of the young embryo. It is, so to speak, a part of the brain coming out to see. In the mollusk, on the contrary, the retina is formed from the external layer of the embryo. Here heredity is out of the question because of this difference of formation and because the man is not descended from the mollusk nor the mollusk from man. The structure of the eye involves the combination of such a large number of elements and must satisfy so many conditions before it is good for anything, that it is practically impossible to explain it either as the effect of the action of light or as the result of an accretion of slight accidental variations.
But Bergson, coming in with his philosophic faith at the point where science leaves off, calls attention to the fact that while the eye is a complicated structure, seeing is one simple act. Why not begin our explanation with the simple, instead of the complex? The analytical method of the intellect, though useful in its place, does not lead us to the meaning of reality. It is as if we could only see a picture as broken up into a mosaic, or as if we could only consider a movement of the hand in the mathematician's way, as an infinite series of points arranged in a curve.
So the eye with its marvelous complexity of structure, may be only the simple act of vision, divided for us into a mosaic of cells, whose order seems marvelous to us because we have conceived the whole as an assemblage....
Mechanism and finalism both go too far, for they attribute to Nature the most formidable of the labors of Hercules in holding that she has exalted to the simple act of vision an infinity of infinitely complex elements, whereas Nature has had no more trouble in making an eye than I have in lifting my hand. Nature's simple act has divided itself automatically into an infinity of elements which are then found to be coordinated to one idea, just as the movement of my hand has dropped an infinity of points which are then found to satisfy one equation.—"Creative Evolution", pp. 90-91.