You say you are a nameless man. You are not to your wife and to your child. You will not long remain so to your immediate colleagues if you can answer their simple questions when they come into your office. You are not nameless to me. Do not remain nameless to yourself — it is too sad a way to be. Know your place in the world and evaluate yourself fairly, not in terms of the naïve ideals of your own youth, nor in terms of what you erroneously imagine your teacher's ideals are.

No one really understands quantum mechanics.

We have found it of paramount importance that in order to progress, we must recognize our ignorance and leave room for doubt.

It does not make any difference how beautiful your guess is. It does not make any difference how smart you are, who made the guess, or what his name is if it disagrees with experiment it is wrong. That is all there is to it.

Religion is a culture of faith; science is a culture of doubt.

What Do You Care What Other People Think?

Agnostic for me would be trying to weasel out and sound a little nicer than I am about this.