A determinist states that, in the same conditions, the same phenomena occur. However, the same conditions can never, by definition, obtain in the life of the self, because each, artificially isolated, moment of its duration includes the entire past, which is, consequently, different for each moment. By contrast with the universe of abstract equations, the same situation never occurs twice in the being endowed with memory; since real time is absolutely irreversible, neither the same cause nor the same effect can ever reappear in experience.