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

Physics is like sex: sure, it may give some practical results, but that's not why we do it.

Our poets do not write about it; our artists do not try to portray this remarkable thing. I don't know why. Is nobody inspired by our present picture of the universe? The value of science remains unsung by singers... This is not yet a scientific age.

We never are definitely right, we can only be sure we are wrong.

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

I don't feel frightened by not knowing things, by being lost in the mysterious universe without any purpose - which is the way it really is, as far as I can tell. Possibly. It doesn't frighten me.

Work as hard and as much as you want to on the things you like to do the best.