Passage Summary: The author argues that no one is ever truly selfless because helping others makes you feel good about yourself, and wanting to feel good is a selfish motive.

Conclusion: Genuinely altruistic behavior does not exist.

Reasoning: Everyone needs self-esteem, which comes from feeling useful; therefore, any act that looks selfless is actually motivated by the self-interested desire to boost one's own self-esteem.

Analysis: The argument suffers from a classic flaw of redefinition or circularity. It assumes that because a person derives a psychological benefit (self-esteem) from an action, that benefit must have been the primary motivation for the action. It's a bit like saying no one ever gives a gift because they like the recipient, but only because they like the feeling of being a 'gift-giver.' Look for an answer that points out the author is essentially defining 'self-interest' so broadly that it's impossible for any human action to be considered altruistic.