The place to improve the world is first in one's own heart and head and hands, and then work outward from there.

The truth knocks on the door and you say, "Go away, I'm looking for the truth," and so it goes away. Puzzling.

One geometry cannot be more true than another; it can only be more convenient. Geometry is not true, it is advantageous.

Boredom always precedes a period of great creativity.

For every fact there is an infinity of hypotheses.

It is a puzzling thing. The truth knocks on the door and you say, 'Go away, I'm looking for the truth,' and so it goes away. Puzzling.