As a human, one cannot claim one's actions are determined by external forces; this is the core statement of existentialism. One is "condemned" to this eternal freedom; human beings exist before the definition of human identity exists. One cannot define oneself as a thing in the world, as one has the freedom to be otherwise. One is not "a philosopher", as at some point one must/will cease the activities that define the self as "a philosopher". Any role that one might adopt does not define one as there is an eventual end to one's adoption of the role; i.e. other roles will be assigned to us, "a chef", "a mother". The self is not constant, it cannot be a thing in the world. Though one cannot assign a positive value to definitions that may apply to oneself, one remains able to say what one is not.