The progress of living matter consists in a differentiation of function which leads first to the production and then to the increasing complication of a nervous system capable of canalizing excitations and of organizing actions: the more the higher centres develop, the more numerous become the motor paths among which the same excitation allows the living being to choose, in order that it may act. An ever greater latitude left to movement in space—this indeed is what is seen. What is not seen is the growing and accompanying tension of consciousness in time. Not only, by its memory of former experience, does this consciousness retain the past better and better, so as to organize it with the present in a newer and richer decision; but, living with an intenser life, contracting, by its memory of the immediate experience, a growing number of external moments in its present duration, it becomes more capable of creating acts of which the inner indetermination, spread over as large a multiplicity of the moments of matter as you please, will pass the more easily through the meshes of necessity. Thus, whether we consider it in time or in space, freedom always seems to have its roots deep in necessity and to be intimately organized with it. Spirit borrows from matter the perceptions on which it feeds, and restores them to matter in the form of movements which it has stamped with its own freedom.
