 But the proof does not reveal Mill to be a psychological egoist. While Mill does say that each person has an ultimate desire for her own happiness, he does not say that this is each person’s only ultimate desire. Indeed, in the second half of the proof he allows that some agents have a disinterested concern for virtue and that they care about virtue for its own sake (IV 4–5). And what is true of virtue is no less true of less grand objects of desire, such as money or power (IV 6). These too it is possible to desire for their own sakes. If psychological egoism claims that one’s own happiness is the only thing that is desired for its own sake, then this shows that Mill is not a psychological egoist.