"The only way to do something is to do it. Not to talk about it, not to plan it, but to do it."

"I would rather have a world with five billion people that are happy and healthy and well-fed and full of wonderful things than a world with twenty billion people who are starving and miserable."

"The thing that bothered me about it was that I was doing work for the military, and I didn't like that."

"I don't believe in the idea of a 'good' or 'bad' atom. I just believe in atoms."

"I would like to add a third possibility, that it might be that, when we die, we just die, and that's the end of it."