"The only way to do great work is to love what you do."

"I believe that in the long run, the only way we can survive is to make the world safe for peace."

"The atomic bomb made the prospect of future war unendurable. It has led us up those last few steps to the mountain pass; and beyond there is a different country."

"In some sort of crude sense which no vulgarity, no humor, no overstatement can quite extinguish, the physicists have known sin; and this is a knowledge which they cannot lose."

"The atomic age has changed everything, save our modes of thinking, and thus we drift toward unparalleled catastrophe."