Memory is not a mere repository for past events. This was Henri Bergson's fundamental claim about consciousness. In distinguishing our psychic constitution by its sense of the past, Bergson differentiates our perception of time from a process in which one instant merely replaces another. While Bergson cast his ideas in terms of the biological sciences, his analysis did not neglect the moral impulse that accompanies the condensation of history with which we continuously live. Classifying human existence in this way bears on ethical and political questions. How such questions can plague the...