The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.

I even got a letter from a young woman in British Columbia that began as follows: 'Today I am eighteen. I am sitting at the window, looking out at the rain, and thinking how much I love you.'

The significant chemicals of living tissue are rickety and unstable, which is exactly what is needed for life.

I figure that if God actually does exist, he is big enough to understand an honest difference of opinion.

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.

To test a perfect theory with imperfect instruments did not impress the Greek philosophers as a valid way to gain knowledge.

The law of conservation of energy tells us we can't get something for nothing, but we refuse to believe it.