Man knows much more than he understands.

Exaggerated sensitiveness is an expression of the feeling of inferiority.

I am grateful for the idea that has used me.

The mathematical life of a mathematician is short. Work rarely improves after the age of twenty-five or thirty. If little has been accomplished by then, little will ever be accomplished.

Tears and complaints - the means which I have called water power - can be an extremely useful weapon for disturbing cooperation and reducing other to a condition of slavery.

More important than innate disposition, objective experience, and environment is the subjective evaluation of these. Furthermore, this evaluation stands in a certain, often strange, relation to reality.

The style of life is a unity because it has grown out of the difficulties of early life and out of the striving for a goal.