Transformative experiences have an epistemic dimension and a personal dimension. An epistemically transformative experience is an experience that provides knowledge that is epistemically inaccessible to the knower until he or she has that experience. As one might put it, the content of the proposition describing the experience is graspable only by having the experience itself. The paradigmatic cases of such experience involve cognitive phenomenological states, such as the state of knowing what it’s like to see color or the state of knowing what it’s like to hear music. A personally transformative experience involves an experience that transforms the self, the subjective preferences, or the epistemic states of a knower in some deep and perhaps even unpredictable way.