Preserve your energy - do not waste it on mediocre activity.
I found that my name signed to a check was even more welcome than when signed to a letter.
The author lives with one foot in an everyday world and the other feeling about anxiously for a foothold in another more precarious one.
Of one thing the reader can be certain: the more easily anything reads, the harder it has been to write.
Courage was America's watchword, but a courage of the body rather than of the soul - physical courage, not moral.
I hate those men who would send into war youth to fight and die for them; the pride and cowardice of those old men, making their wars that boys must die.
. . . if one can remember without loving, then couldn't one love without remembering?
Great people have a vision of their lives that they practice emulating each and every day. They go to work on their lives, not just in their lives.
One does not have to appeal to God to set the initial conditions for the creation of the universe, but if one does He would have to act through the laws of physics.
Everybody knows how to utter a complaint, but few can express a graceful compliment.
When I told my son that I had to give a talk about my work to non-mathematicians, he warned me that regular people don't think like mathematicians.