To test whether you have learned an idea or a definition, rephrase what you just learned without using the new word.

What is necessary for 'the very existence of science,' and what the characteristics of nature are, are not to be determined by pompous preconditions, they are determined always by the material with which we work, by nature herself. We look, and we see what we find, and we cannot say ahead of time successfully what it is going to look like. ... It is necessary for the very existence of science that minds exist which do not allow that nature must satisfy some preconceived conditions.

I think I can safely say that nobody understands Quantum Mechanics.

The work I have done has, already, been adequately rewarded and recognized. Imagination reaches out repeatedly trying to achieve some higher level of understanding, until suddenly I find myself momentarily alone before one new corner of nature's pattern of beauty and true majesty revealed. That was my reward.

Don't pay attention to "authorities," think for yourself.

The electron is a theory we use; it is so useful in understanding the way nature works that we can almost call it real.

We've learned from experience that the truth will out.