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.

What is courage? Courage is the willingness to risk failure...There is only one danger I find in life, and that, indeed, is a real one. You may take too many precautions.

We must interpret a bad temper as a sign of inferiority.

A simple rule in dealing with those who are hard to get along with is to remember that this person is striving to assert his superiority; and you must deal with him from that point of view.

Follow your heart but take your brain with you.

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.

He used to say to his melancholia patients: "You can be cured in fourteen days if you follow this prescription.Try to think every day how you can please someone.