"My practicality consists in this, in the knowledge that if you beat your head against the wall it is your head which breaks and not the wall - that is my strength, my only strength."

"To tell the truth is revolutionary."

"I'm a pessimist because of intelligence, but an optimist because of will."

"Pessimism of the spirit; optimism of the will."

"The challenge of modernity is to live without illusions and without becoming disillusioned."