The worthwhile problems are the ones you can really solve or help solve, the ones you can really contribute something to... No problem is too small or too trivial if we can really do something about it.

If it disagrees with experiment, it's wrong.

Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on.

So this piece of dirt waits four and a half billion years and evolves and changes, and now a strange creature stands here with instruments and talks to the strange creatures in the audience. What a wonderful world!

... it is impossible to explain honestly the beauties of the laws of nature in a way that people can feel, without their having some deep understanding of mathematics. I am sorry, but this seems to be the case.

We have this terrible struggle to try to explain things to people who have no reason to want to know.

A scientist is never certain. ... We absolutely must leave room for doubt or there is no progress and there is no learning.