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

The trouble with most of the things that people want is that they get them.

[Attributing the origin of life to spontaneous generation.] However improbable we regard this event, it will almost certainly happen at least once.... The time... is of the order of two billion years.... Given so much time, the "impossible" becomes possible, the possible probable, and the probable virtually certain. One only has to wait: time itself performs the miracles.

There is nothing worth having that can he obtained by nuclear war - nothing material or ideological - no tradition that it can defend. It is utterly self-defeating.

Since we have had a history, men have pursued an ideal of immortality.

Nuclear weapons offer us nothing but a balance of terror, and a balance of terror is still terror.

The great questions are those an intelligent child asks and, getting no answers, stops asking.