A scientist lives with all reality. There is nothing better. To know reality is to accept it, and eventually to love it.

A physicist is an atom's way of knowing about atoms.

As you lecture, you keep watching the faces, and information keeps coming back to you all the time.

Dropping those atomic bombs on Hiroshima and Nagasaki was a war crime.

I can conceive of no nightmare so terrifying as establishing communication with a so-called superior (or, if you wish, advanced) technology in outer space.

The only use for an atomic bomb is to keep somebody else from using one. It can give us no protection - only the doubtful satisfaction of retaliation...

I am growing old, and my future, so to speak, is already behind me.