You don’t pay back, you pay forward.

No statement should be believed because it is made by an authority.

It's a man's business to be what he is, and to be it in style.

I am free, no matter what rules surround me. If I find them tolerable, I tolerate them; if I find them too obnoxious, I break them.

Being privileged to work hard for long hours at something you think is worth doing is the best kind of play.

Physicians had gone to their graves calling Pasteur a liar, a fool, or worse—without examining evidence which their “common sense” told them was impossible.

Never pick up a stray kitten . . . unless you've already made up your mind to be owned by it.