In a word, man must create his own essence: it is in throwing himself into the world, suffering there, struggling there, that he gradually defines himself.

Jean-Paul Sartre


p.157 The Writings of Jean-Paul Sartre, Volume 2: Selected Prose by Jean-Paul Sartre, A More Precise Characterization of Existentialism from Action, Vol 44/59 Dec 29, 1944 (Northwestern University Press, 1985)