Over and over again as an Objectivist you hear people say things like "How can selfishness lead to moral action?" or "How can you be moral if your morals are made up, if they don't come from God or the community, or society?"
I would respond in kind and ask how one can act morally without being selfish, or without coming to moral principles on one's own through thought and introspection.
Learn how & why... The Objectivist Ethics