When stupidity is considered patriotism, it is unsafe to be intelligent.

The true delight is in the finding out rather than in the knowing.

I believe in evidence. I believe in observation, measurement, and reasoning, confirmed by independent observers. I'll believe anything, no matter how wild and ridiculous, if there is evidence for it. The wilder and more ridiculous something is, however, the firmer and more solid the evidence will have to be.

I'm gradually managing to cram my mind more and more full of things. I've got this beautiful mind and it's going to die, and it'll all be gone. And then I say, not in my case. Every idea I've ever had I've written down, and it's all there on paper. And I won't be gone; it'll be there.

It's humbling to think that all animals, including human beings, are parasites of the plant world.

Never judge your own writing. You're not fit to do so.

Theories are not so much wrong as incomplete