How do you know? May there not be a fundamental mistake in the idea of heredity as we conceive it? At one end of the beam of those scales which we accuse of injustice hangs heredity, but the other is borne down by something different, which we have never taken into account, for it has not yet a name, something which is the antithesis of heredity, which cleaves into the future instead of emerging from the past and which we might call preexistence or prenatality. Even as our dead still live in us, so we have already lived in them. There is no reason to believe that the future, which is full of life, is less active and less potent than the past, which is full of the dead. Instead of descending, should we not rather ascend the course of the years to discover the source of our actions? We know not in what fashion those already dwell in us who shall be born of us, down to the last generation; but that they do dwell in us is certain. Whatever the number of our descendants, in the sequence of the ages, whatever the transformations which the elements, climates, countries and centuries may cause them to undergo, they will keep intact, through all vicissitudes, the principle of life which they have derived from us. They have not obtained it elsewhere or they could not be what they are. They have really issued from us; and, if they have issued from us, it is because they were in us from the first. What were they doing within us, all these innumerable, accumulated lives? Is it permissible to suppose that they were absolutely inactive? Then what were their functions, what their power? What divided them from us? When did we begin, where did they end? At what point did their thoughts and their desires mingle with ours? “How could they think and act in us,” you ask, “having as yet no brain?” True; but they had ours. The dead too are without a brain; nevertheless no one will deny that they continue to think and act in us. This brain of which we are so proud is not the source but the condenser of thought and will. Like the Leyden jar or the Ruhmkorff coil, it exists, it is animated only so long as the electric fluid of life passes through it or resides in it. It does not produce this fluid, it collects it; what matters is not its convolutions, which may be compared with the windings of an induction-coil, but the life that flows through it; and what can this life be, if it be not the sum of all the existences which are accumulated within us, which are not extinguished at our death, which begin before our birth and which continue us, forwards, and backwards, into the infinity of time? 2