After the existential drama of Heidegger's notion of being-towards-death, why do we need a discussion of conscience? As so often in Being and Time, Heidegger insists that although his description of being-towards-death is formally or ontologically correct, it needs more compelling content at what Heidegger calls the "ontic" level, that is, at the level of experience. Finitude gets a grip on the self through the experience of conscience. For me, the discussion of conscience contains the most exciting and challenging pages in Being and Time. Let me try and sketch as simply as possible the complex line of Heidegger's argument.