In this paper, we argue that knowledge of emotions essentially depends on introspecting the phenomenology of emotional experiences, and that introspection of emotional experiences is a process by stages, where the most fundamental stage is a non-classificatory introspective state, i.e., one that does not depend on the subject’s classifying the introspected emotion as an instance of any experience type. We call such a non-classificatory kind of introspection primitive introspection. Our main goal is to show that, although not sufficient, primitive introspection is a necessary ground to acquire knowledge of emotions. Our main argument is phenomenological: by examining a variety of examples, we suggest that an accurate analysis of the introspe...