In the investigation of a neurotic style of life, we must always suspect an opponent, and note who suffers most because of the patient's condition. Usually this is a member of the family.

There is no thing as a man who does not create mathematics and yet is a fine mathematics teacher. Textbooks, course material-these do not approach in importance the communication of what mathematics is really about, of where it is going, and of where it currently stands with respect to the specific branch of it being taught. What really matters is the communication of the spirit of mathematics. It is a spirit that is active rather than contemplative-a spirit of disciplined search for adventures of the intellect. Only as adventurer can really tell of adventures.

No experience is a cause of success or failure. We do not suffer from the shock of our experiences, so-called trauma - but we make out of them just what suits our purposes.

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.

All failures are so because they lack social interest.

The truth is often a terrible weapon of aggression. It is possible to lie, and even to murder, with the truth.

War is organized murder and torture against our brothers.