Worry is a form of fear.

Your writing is never as good as you hoped; but never as bad as you feared.

Much of the most important evils that mankind have to consider are those which they inflict upon each other through stupidity or malevolence or both.

One of the painful things about our time is that those who feel certainty are stupid, and those with any imagination and understanding are filled with doubt and indecision.

What is best in mathematics deserves not merely to be learnt as a task, but to assimilated as a part of daily thought, and brought again and again before the mind with ever-renewed encouragement.

My doctor said to me afterwards, 'When you were ill you behaved like a true philosopher. Every time you came to yourself you made a joke.' I never had a compliment that pleased me more.

A happy life must be to a great extent a quiet life, for it is only in an atmosphere of quiet that true joy dare live.