Our modern states are preparing for war without even knowing the future enemy.

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

It is the individual who is not interested in his fellow men who has the greatest difficulties in life and provides the greatest injury to others. It is fro+m among such individuals that all human failures spring.

In the company of friends, writers can discuss their books, economists the state of the economy, lawyers their latest cases, and businessmen their latest acquisitions, but mathematicians cannot discuss their mathematics at all. And the more profound their work, the less understandable it is.

Every therapeutic cure, and still more, any awkward attempt to show the patient the truth, tears him from the cradle of his freedom from responsibility and must therefore reckon with the most vehement resistance.

A lie would have no sense unless the truth were felt as dangerous.

It is well known that those who do not trust themselves never trust others.