People start their lives at last when they are able to live for something other than themselves.

You believe in a god that plays dice; I believe in law & order.

When the nazis came to power, I looked to the universities that prided themselves upon their intellectual freedom, and they failed me. I looked to the German press, which prided itself on the freedom of the press, and it failed me. Until at last the churches stood alone, and that for which I once had little regard earned my respect.

The thinking that got us to where we are is not the thinking that will get us to where we want to be.

For scientific endeavor is a natural whole the parts of which mutually support one another in a way which, to be sure, no one can anticipate.

While I am a convinced pacifist there are circumstances in which I believe the use of force is appropriate - namely, in the face of an enemy unconditionally bent on destroying me and my people.

The future is of greater interest to me than the past, since that is where I intend to spend the rest of my life.