No Excuses: Existentialism and the Meaning of Life

Sartre' Being-for-Others and No Exit (1x22)

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Many philosophers have argued that we know the existence of others through an obvious kind of inference. Sartre, however, insists that our knowledge of them comes first from being looked at by them. Or as one of the characters in No Exit famously says, "L'enfer, ce sont les autres."