In contrast to the widely held view that emotions are obstacles to ideal epistemic functioning, emotions, as evaluative perceptual states, can contribute in significant ways to our achievement of valuable epistemic goods including justified beliefs, understanding, and wisdom. That emotions are evaluative perceptual states – call this the perceptual thesis of emotion – is evidenced by the extent of the structural and functional parallels between emotions and sense perceptions. Emotions, like sense perceptions, can be both original and acquired and are distinct from the sensory inputs that give rise to them; they also resemble sense perceptions in being passive, intentional mental states with propositional content and they are sources of beli...