It is our responsibility to leave the people of the future a free hand.

It's because somebody knows something about it that we can't talk about physics. It's the things that nobody knows anything about we can discuss.

If you have any talent, or any occupation that delights you, do it, and do it to the hilt. Don't ask why, or what difficulties you may get into.

All the time you're saying to yourself, 'I could do that, but I won't,'--which is just another way of saying that you can't.

But the real glory of science is that we can find a way of thinking such that the law is evident.

We are not to tell nature what she’s gotta be... She's always got better imagination than we have.

Ordinarily it would take me about fifteen minutes to get a hallucination going," wrote Feynman, "but on a few occasions, when I smoked some marijuana beforehand, it came very quickly.