For Freud, man is a divided subject, whereas for Heidegger man is the Being (Dasein, Being-There) - that is, an entity defined by possible ways of being. The two definitions seem irreconcilable. But on closer examination, they converge in very important ways. We can point out at least three of these: (a) for Heidegger as for Freud, men are not essentially rigid; they are plastic, flexible beings. Corresponding to the primacy of possibility in Heidegger is the plasticity of the drives in Freud; (b) a conflicted vision: the identity of human beings consists of conflict between the desire to be in accord and that of not being in accord with one's self; (c) in contrast to the philosophical tradition, which today is represented in analytic philosophy and cognitivism, for Freud and Heidegger the human mind expresses itself in logical pluralism, i.e., in different styles of thinking. Both Freud and Heidegger implicitly made use of flexible logic in their research.