I do not believe in the God of theology who rewards good and punishes evil. My God created laws that take care of that. His universe is not ruled by wishful thinking, but by immutable laws.

The stakes are immense, the task colossal, the time is short. But we may hope - we must hope - that man's own creation, man's own genius, will not destroy him.

Common sense consists of those layers of prejudice laid down before the age of 18.

The human spirit must prevail over technology.

A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.

It takes a touch of genius - and a lot of courage to move in the opposite direction.

I rarely think in words at all.