“[Several theories of ethics or rationality claim that], in deciding what would be best for someone, we should give equal weight to all the parts of this person’s future. Later events may be less predictable; and a predictable event should count for less if it is less likely to happen. But it should not count for less merely because, if it happens, it will happen later.”

— Derek Parfit, Reasons and Persons (1984), p. 4