Sartre on Freedom

Thus, in the name of that will to freedom which is implied in freedom itself, I can form judgments upon those who seek to hide from themselves the wholly voluntary nature of their existence and its complete freedom. Those who hide from this total freedom, in a guise of solemnity or with deterministic excuses, I shall call cowards. Others, who try to show that their existence is necessary, when it is merely an accident of the appearance of the human race on earth--I shall call scum.

Sartre, Existentialism is a Humanism