"It is not possible to be a scientist unless you believe that it is good to learn. It is not possible to be a scientist unless you believe that it is of the highest value to learn."

"The atomic bomb is a terrible weapon. It is a weapon that can bring about the destruction of civilization. And it is a weapon that must be controlled."

"The atomic bomb is a weapon which is new in many respects. It is a weapon of terror, a weapon for exterminating whole populations."

"In the spring of 1936, I was introduced by friends to Jean Tatlock. In the autumn, I began to court her. We were at least twice close enough to marriage to think of ourselves as engaged."

"The experience of the war has made it clear that the future of civilization depends on the development of a world community."