I think a power to do something is of value. Whether the result is a good thing or a bad thing depends on how it is used, but the power is a value.

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.

Know how to solve every problem that has been solved.

When you get as old as I am, you start to realize that you've told most of the good stuff you know to other people anyway.

I don't have to be good because they think I'm going to be good.

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

Have no respect whatsoever for authority; forget who said it and instead look what he starts with, where he ends up, and ask yourself, "Is it reasonable?"