An Oxford philosopher thinks he can distill all morality into a formula. Is he right?
The philosopher Derek Parfit believes that neither of the people is you, but that this doesn’t matter. It doesn’t matter that you have ceased to exist, because what has happened to you is quite unlike ordinary death: in your relationship to the two new people there is everything that matters in ordinary survival—a continuity of memories and dispositions that will decay and change as they usually do. Most of us care about our future because it is ours—but this most fundamental human instinct is based on a mistake, Parfit believes. Personal identity is not what matters.