Ideas come in pairs and they contradict one another; their opposition is the principal engine of reflection.

There is no book of mine that I reject. That does not mean that I find them good.

He is always becoming, and if it were not for the contingency of death, he would never end.

Handing over a bank note is enough to make a bicycle belong to me, but my entire life is needed to realize this possession.

We are now in a position to understand the anti-Semite. He is a man who is afraid. Not of the Jews, to be sure, but of himself, of his own consciousness, of his liberty, of his instincts, of his responsibilities, of solitariness, of change, of society, and of the world of everything except the Jews.

I maintain that inversion is the effect of neither a prenatal choice nor an endocrinal malformation nor even the passive and determined result of complexes. It is an outlet that a child discovers when he is suffocating.

Man is nothing else but what he purposes, he exists only in so far as he realizes himself, he is therefore nothing else but the sum of his actions, nothing else but what his life is.