Since Kant, many philosophers have struggled to overcome the problems of an empiricist conception of the self. In this paper I argue that Heidegger’s philosophy in Being and Time has to be considered as one of the most powerful attempts to gain an anti-empiricist conception of the self and its unity. I highlight the power of Heidegger’s conception by contrasting it with contemporary empiricist conceptions, namely those of Dennett and Velleman. The basic aspect of Heidegger’s conception can be captured by (...) the claim that the unity of the subject is constituted by relations to an open future. (shrink)