Our defense is not in our armaments, nor in science, nor in going underground. Our defense is in law and order.

What physics looks for: The simplest possible system of thought which will bind together the observed facts.

Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

The best design is the simplest one that works.

A man has to work so hard so that something of his personality stays alive. A tomcat has it so easy, he has only to spray and his presence is there for years on rainy days.

It is difficult even to attach a precise meaning to the term "scientific truth." So different is the meaning of the word "truth" according to whether we are dealing with a fact of experience, a mathematical proposition or a scientific theory. "Religious truth" conveys nothing clear to me at all.

There lies the weaknesss of positivists and professional atheists who are elated because they feel that they have not only successfully rid the world of gods but "bared the miracles." (That is, explained the miracles. - ed.) Oddly enough, we must be satisfied to acknowledge the "miracle" without there being any legitimate way for us to approach it . I am forced to add that just to keep you from thinking that -weakened by age-I have fallen prey to the clergy.