Abstract
Ethics normally proceeds by establishing some kind of ground from which norms can be
derived for human action. However, no such terra firma is found in Jean-Paul Sartre’s Being and
Nothingness, which instead lays down a sedimentary soil consisting of a blend of nothingness and
contingency. This paper aims to show how Sartre is able to build an ethical theory from this
seemingly groundless mixture, and it proceeds in three sections. Section one aims to disentangle
the relation between the for-itself (pour-soi) and the in-itself (en-soi) from antithetical
characterizations by placing them in a state of supervenience. Section two works to explain how
both the in-itself and the for-itself are not divided ontologically, but are both in the same
ontological state, namely, contingency. And in section three, it is argued that Sartre’s ethics
reveals that because human beings share the same thrownness with Others in a world, they have
to take title for such a world. Within a Sartrean ethics of nothingness, one’s nothingness leads
one to the shared nothingness of Others, of which one must take responsibility.