A good world needs knowledge, kindliness, and courage; it does not need a regretful hankering after the past or a fettering of the free intelligence by the words uttered long ago by ignorant men.

Our individual life is brief, and perhaps the whole life of mankind will be brief if measured in astronomical scale

Everything is vague to a degree you do not realize till you have tried to make it precise.

The military superiority of Europe to Asia is not an eternal law of nature, as we are tempted to think, and our superiority in civilization is a mere delusion.

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.

People are zealous for a cause when they are not quite positive that it is true.

To realize the unimportance of time is the gate to wisdom.