"In the spring of 1929, I returned to the United States. I was homesick for this country. I had learned in my student days a great deal about the new physics. I wanted to pursue this myself, to explain…"

"The great thing about science is that it is a way of life that teaches you that you are wrong."

"We must be prepared to make the effort to understand the world, and to live in it as human beings."

"We have to learn to live with the knowledge that we have the power to destroy ourselves, but also the power to save ourselves."

"The atomic bomb is a warning to mankind that we must find a way to live together in peace."