Thrown into the atmosphere of action [in 1954], I suddenly understood the kind of neurosis that dominated all my previous work. I had not been able to recognize it before: I was inside. Simone de Beauvoir had guessed these reasons before I did.

Introspection is always retrospection

There are two kinds of existentialist; first, those who are Christian...and on the other hand the atheistic existentialists, among whom...I class myself. What they have in common is that they think that existence precedes essence, or, if you prefer, that subjectivity must be the turning point.

Man is what he wills himself to be.

So that is what hell is. I would never have believed it. You remember: the fire and brimstone, the torture. Ah! the farce. There is no need for torture: Hell is other people.

We do not know what we want and yet we are responsible for what we are - that is the fact.

I think there is an enormous diference between speaking and writing. One rereads what one writes. But one might read it slowly or quickly. In other words, you do not know how long you will have to spend deliberating over a sentence. ... But if I listen to a tape recorder, the listening time is determined by the speed at which the tape turns and not by my own needs.