PAPER ABSTRACT: There is a disagreement between Aristotle and Hume about the nature of desire.  According to Aristotle, belief and desire both have an aim: just as belief aims at truth, desire aims at goodness.  According to Hume, desires, unlike beliefs, are “original existences” that cannot be correct or incorrect.  In this paper I shall articulate and defend a version of the Aristotelian view, on which desires are representations of goodness.  This presents a challenge for metaphysical naturalists (who typically adopt a sentimentalist account of practical reason) and explains the possibility of (one kind of) non-intellectual knowledge.