Philosophical theories about the nature of belief can be roughly classified into two groups: those that treat beliefs as occurrent mental states or episodes and those that treat beliefs as dispositions. David Hume's A Treatise of Human Nature seems to contain a classic example of an occurrence theory of belief. Hume defines ‘belief’ as ‘a lively idea related to or associated with a present impression’ (Treatise 1.3.7.5 96). This definition suggests that believing is an occurrent mental state, such as judging, or thinking about something in a particular manner. However, at the same time, a number of Hume's readers claim to find elements in his writings that are suggestive of a dispositional account of belief. Moreover, these elements are sometimes taken as signs of the inadequacy of Hume's account of belief and his dissatisfaction with it. If Hume is not, in fact, wholeheartedly committed to a thoroughgoing occurrence theory of belief, one wonders just who is.