The author considers the theoretical contributions of Lacan and Bion in relation to therapeutic action or the mechanisms of the cure. Whereas Bion felt that the analysand should ultimately experience transformation in O, Lacan described the analysand's goal as not to give in to one's desire or to be one's self. The author distinguishes among various types of neurotic and psychotic structures in discussing the limits of the cure, noting that the analyst's acts—as well as his words—can function as analytic interpretations. Lacan's theories jouissance, the sexual phantom, identification with the analytic function, and post-analytic effects are also discussed.