  Our moral evaluations of persons and their character traits, on Hume’s positive view, arise from our sentiments. The virtues and vices are those traits the disinterested contemplation of which produces approval and disapproval, respectively, in whoever contemplates the trait, whether the trait’s possessor or another. These moral sentiments are emotions (in the present-day sense of that term) with a unique phenomenological quality, and also with a special set of causes. They are caused by contemplating the person or action to be evaluated without regard to our self-interest, and from a common or general perspective that compensates for certain likely distortions in the observer’s sympathies, as explained in  Section 8.  Approval (approbation) is a pleasure, and disapproval (disapprobation) a pain or uneasiness. The moral sentiments are typically calm rather than violent, although they can be intensified by our awareness of the moral responses of others. They are types of pleasure and uneasiness that are associated with the passions of pride and humility, love and hatred: when we feel moral approval of another we tend to love or esteem her, and when we approve a trait of our own we are proud of it. Some interpreters analyze the moral sentiments as themselves forms of these four passions; others argue that Hume’s moral sentiments tend to cause the latter passions. We distinguish which traits are virtuous and which are vicious by means of our feelings of approval and disapproval  toward the traits; our approval of actions is derived from approval of the traits we suppose to have given rise to them. We can determine, by observing the various sorts of traits toward which we feel approval, that every such trait — every virtue — has at least one of the following four characteristics: it is either immediately agreeable to the person who has it or to others, or it is useful (advantageous over the longer term) to its possessor or to others. Vices prove to have the parallel features: they are either immediately disagreeable or disadvantageous either to the person who has them or to others. These are not definitions of ‘virtue’ and ‘vice’ but empirical generalizations about the traits as first identified by their effects on the moral sentiments.