Teaching should be such that what is offered is perceived as a valuable gift and not as a hard duty.

You teach me baseball and I'll teach you relativity...No we must not. You will learn about relativity faster than I learn baseball.

I live in that solitude which is painful in youth, but delicious in the years of maturity.

When a man is sufficiently motivated, discipline will take care of itself.

[Max Planck] was one of the finest people I have ever known... but he really didn't understand physics, [because] during the eclipse of 1919 he stayed up all night to see if it would confirm the bending of light by the gravitational field. If he had really understood [general relativity], he would have gone to bed the way I did

Bureaucracy is the death of all sound work.

To the extent math refers to reality, we are not certain to the extent we are certain, math does not refer to reality.