I know of no better life purpose than to perish in attempting the great and the impossible.

The existence of forgetting has never been proved: We only know that some things don't come to mind when we want them.

You gave him an opportunity of showing greatness of character and he did not seize it. He will never forgive you for that.

It is only because man believes himself to be free, not because he is free, that he experiences remorse and pricks of conscience.

The belief in authority is the source of conscience; which is therefore not the voice of God in the heart of man, but the voice of some men in man.

Necessity is an interpretation, not a fact.

What do you regard as most humane? To spare someone shame.