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 introspective process through which one comes to know, or refines one’s knowledge of, one’s current emotion requires that one primitively introspects it. (shrink)