My formula for happiness: a Yes, a No, a straight line, a goal.

It takes just such painful and terrible things to occur for the great emancipation to take place.

Is life not a thousand times too short for us to bore ourselves?

An artist chooses his subjects: that is the way he praises.

I understand by 'freedom of spirit' something quite definite - the unconditional will to say No, where it is dangerous to say No.

History belongs above all to the man...who needs models, teachers, comforters and cannot find them among his contemporaries.

The sick are the greatest danger for the healthy; it is not from the strongest that harm comes to the strong, but from the weakest.