“ I cannot make liberty my aim unless I make that of others equally my aim. Consequently, when I recognise, as entirely authentic, that man is a being whose existence precedes his essence, and that he is a free being who cannot, in any circumstances, but will his freedom, at the same time I realize that I cannot not will the freedom of others. ”
 Jean-Paul Sartre, Existentialism Is a Humanism (1946). copy citation