As a scientist, I am not sure anymore that life can be reduced to a class struggle, to dialectical materialism, or any set of formulas. Life is spontaneous and it is unpredictable, it is magical. I think that we have struggled so hard with the tangible that we have forgotten the intangible.
You never know how a horse will pull until you hook him up to a heavy load.
Humor is the only test of gravity, and gravity of humor; for a subject which will not bear raillery is suspicious, and a jest which will not bear serious examination is false wit.
I like work: it fascinates me. I can sit and look at it for hours.
Preserving health by too severe a rule is a worrisome malady.
A tactical retreat is not a bad response to a surprise assault, you know. First you survive. Then you choose your own ground. Then you counterattack.
You don't stop laughing because you grow old. You grow old because you stop laughing.