Princeton is a wonderful little spot. A quaint and ceremonious village of puny demigods on stilts.

[Newton wrote to Halley ... that he would not give Hooke any credit] That, alas, is vanity. You find it in so many scientists. You know, it has always hurt me to think that Galileo did not acknowledge the work of Kepler.

The thinking it took to get us into this mess is not the same thinking that is going to get us out of it.

What separates me from most so-called atheists is a feeling of utter humility toward the unattainable secrets of the harmony of the cosmos.

Berlin is the place to which I am most closely bound by human and scientific ties.

I have just got a new theory of eternity.

As long as there will be a man, there will be wars.