I'd hate to die twice. It's so boring.

The test of all knowledge is experiment.

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!

The difficulty really is psychological and exists in the perpetual torment that results from your saying to yourself, "But how can it be like that?" which is a reflection of uncontrolled but utterly vain desire to see it in terms of something familiar. ... If you will simply admit that maybe Nature does behave like this, you will find her a delightful, entrancing thing. Do not keep saying to yourself, if you can possible avoid it, "But how can it be like that?" because you will get 'down the drain', into a blind alley from which nobody has escaped. Nobody knows how it can be like that.

We need to teach how doubt is not to be feared but welcomed. It's OK to say, "I don't know."

I'm trying to find out NOT how Nature could be, but how Nature IS.

It is the fact that the electrons cannot all get on top of each other that makes tables and everything else solid.