So we have assumed the existence of a homogeneous Space and, with Kant, distinguished this space from the matter which fills it. With him we have admitted that homogeneous space is a “form of our sensibility ” : and we understand by this simply way that other minds, e.g. those of animals, although they perceive objects, do not distinguish them so clearly either from one another or from themselves. This intuition of a homogeneous medium, an intuition peculiar to man, enables us to externalize our concepts in relation to one another, reveals to us the objectivity of things, and thus, in two ways, on the one hand by getting everything ready for language, and on the other by showing us an external world, quite distinct from ourselves, in the perception of which all minds have a common share, foreshadows and prepares the way for social life. Over against this homogeneous space we have put the self as perceived by an attentive consciousness, a living self, whose states, at once undistinguished and unstable, cannot be separated without changing their nature, and cannot receive a fixed form or be expressed in words without becoming public property. How could this self, which distinguishes external objects so sharply and represents them so easily by means of symbols, withstand the temptation to introduce the same distinctions into its own life and to replace the interpenetration of its psychic states, their wholly qualitative multiplicity, by a numerical plurality of terms which are distinguished from one another, set side by side, and expressed by means of words ? In place of a heterogeneous duration whose moments permeate one another, we thus get a homogeneous time whose moments are strung on a spatial line. In place of an inner life whose successive phases, each unique of its kind, cannot be expressed in the fixed terms of language, we get a self which can be artificially reconstructed, and simple psychic states which can be added to and taken from one another just like the letters of the alphabet in forming words. Now, this must not be thought to be a mode of symbolical representation only, for immediate intuition and discursive thought are one in concrete reality, and the very mechanism by which we only meant at first to explain our conduct will end by also controlling it. Our psychic states, separating then from each other, will get solidified; between our ideas, thus crystallized, and our external movements we shall witness permanent associations being formed ; and little by little, as our consciousness thus imitates the process by which nervous matter procures reflex actions, automatism will cover over freedom. It is just at this point that the associationists and the determinists come in on the one side, and the Kantians on the other.
( Henri Bergson )