The opinion that I want to discuss in this essay is fairly commonly although not universally held among moralists. It is the opinion that there is never a moral duty to try to promote one's own pleasure for the sake of that pleasure although, contrariwise, there is often a moral duty to try to promote the pleasure of others for the sake of that pleasure. I cannot myself assent to the view, and I want to explain why I cannot; but I allow that the opposition I have to face is formidable. Indeed there are authors like Meinong who would make degree of self-sacrifice the standard of morality.