Reasons, identity, and future people › What time changes, and what it does not settle

In the second part, Parfit examines attitudes toward different times. A familiar contrast concerns suffering that lies ahead and suffering already over. A person might strongly prefer that an unpleasant experience be in the past, even when the past experience would have lasted longer. The question is whether the preference can be justified, rather than merely whether it is recognizable.

His discussion separates temporal position from other relevant differences. Uncertainty about a distant outcome can matter to a present decision. A difference in what we can influence can matter too. Neither point establishes that a benefit deserves less concern simply because it occurs later. The reason for the discount needs to be identified rather than smuggled into the date.

Imagine choosing between helping your future self avoid discomfort next week and helping that same person avoid a much greater difficulty years from now. This invented example does not prescribe a particular financial or medical choice. It isolates the question of whether temporal distance alone supplies a reason to neglect the larger difficulty, assuming the other relevant conditions have been held fixed.

Parfit uses such questions to test the authority of self-interest over a whole life. Why should belonging to the same life make benefits at different times equally important to rational concern? Why should the distinction between different people have the significance assigned to it? These are questions about justification. The fact that we care strongly about our future does not answer them by itself.