A philosopher once said, 'It is necessary for the very existence of science that the same conditions always produce the same results.' Well, they don't!

I think it's much more interesting to live not knowing than to have answers which might be wrong.

I don't believe I can really do without teaching. The reason is, I have to have something so that when I don't have any ideas and I'm not getting anywhere, I can say to myself, "At least I'm living; at least I'm doing something. I'm making some contribution." It's just psychological.

Nature has a great simplicity and therefore a great beauty.

The highest forms of understanding we can achieve are laughter and human compassion.

For those who want some proof that physicists are human, the proof is in the idiocy of all the different units which they use for measuring energy.

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.