All evil stems from this-that we do. Know how to handle your solitude.

Imagination is the deceptive part in man, the mistress of error and falsehood.

If they [Plato and Aristotle] wrote about politics it was as if to lay down rules for a madhouse. And if they pretended to treat it as something really important it was because they knew that the madmen they were talking to believed themselves to be kings and emperors. They humored these beliefs in order to calm down their madness with as little harm as possible.

The sum of a man's problems come from his inability to be alone in a silent room.

One must know oneself. If this does not serve to discover truth, it at least serves as a rule of life and there is nothing better.

We must learn our limits. We are all something, but none of us are everything.

Man's grandeur is that he knows himself to be miserable.