In the world of physics we watch a shadowgraph performance of the drama of familiar life. The shadow of my elbow rests on the shadow table as the shadow ink flows over the shadow paper. It is all symbolic, and as a symbol the physicist leaves it. ... The frank realisation that physical science is concerned with a world of shadows is one of the most significant of recent advances.

I ask you to look both ways. For the road to a knowledge of the stars leads through the atom; and important knowledge of the atom has been reached through the stars.

Whatever else there may be in our nature, responsibility toward truth is one of its attributes.

We used to think that if we knew one, we knew two, because one and one are two. We are finding that we must learn a great deal more about 'and'.

Electrical force is defined as something which causes motion of electrical charge; an electrical charge is something which exerts electric force.

I don't believe any experiment until it is confirmed by theory. I find this is a witty inversion of "conventional" wisdom.

Proof is an idol before which the mathematician tortures himself.