Quassim Cassam distinguishes between trivial and substantial cases of self-knowledge. At first sight, trivial cases are epistemically distinctive insofar as the agent needn't provide any sort of evidence to ground her claim to knowledge. Substantial cases of self-knowledge such as ‘I know I want to have a second child’ do not seem to bear this distinctive relation to evidence. I will argue, however, that substantial cases of self-knowledge are often epistemically distinctive and, to this end, I will challenge a crucial (...) assumption in the current debate about self-knowledge, namely: if a piece of self-knowledge is based on evidence, it must have been delivered by a detached, theoretical attitude toward oneself (_The Detachment Assumption_). My case against the Detachment Assumption combines a negative and a positive programme. Regarding the negative aspect, I will first present Cassam's case for Inferentialism; second, I will argue that this view about self-knowledge is at odds with the sort of self-improvement that he vindicates in his analysis of epistemic vices and, third, I will conclude that only by allowing for an engaged relation to evidence, can we make sense of that sort of self-improvement. Regarding the positive programme, I will first examine the sensitivity to the music that is specific of a graceful dancer and, on this basis, outline an attitude toward oneself that, despite involving evidence, is not detached or theoretical but engaged, so that it gives rise to a kind of substantial self-knowledge that is both transformative and epistemically distinctive. (shrink)