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.

The only normal people are the ones you don't know very well.

Meanings are not determined by situations, but we determine ourselves by the meanings we give to situations.

The style of life is a unity because it has grown out of the difficulties of early life and out of the striving for a goal.

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.

I am grateful for the idea that has used me.

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