If you want to use your selfishness to help others, then you're not selfish.
Do we really need to go into the question what “selfishness” actually means? In ordinary situations I'd say that “the actual altruist [is] whichever one actually holds open doors for little old ladies”; maybe in certain situations we need different words to specify whether they do so because it's in their own utility function or because of religious/game-theoretical/superrational/acausal/whatever-they-call-it-these-days reasons, but...
Another month has passed and here is a new rationality quotes thread. The usual rules are: