If you are lonely when you're alone, you are in bad company.

All the same, they [books] do serve some purpose. Culture doesn't save anything or anyone, it doesn't justify. But it's a product of man: he projects himself into it, he recognizes himself in it; that critical mirror alone offers him his image.

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.

What's done at night belongs to the night. In the daytime you don't talk about it.

There is no love apart from the deeds of love; no potentiality of love other than that which is manifested in loving.

Introspection is always retrospection

Heroism is not to be won at the point of a pen.