When the problem [quantum chromodynamics] is finally solved, it will all be by imagination. Then there will be some big thing about the great way it was done. But it's simple -it will all be by imagination, and persistence.

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.

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.

A very great deal more truth can become known than can be proven.

I have to disregard everybody else, and then I can do my own work.

The present situation in physics is as if we know chess, but we don't know one or two rules.