The great rule: If the little bit you have is nothing special in itself, at least find a way of saying it that is a little bit special.

Do not say hypothesis, and even less theory: say way of thinking.

Many a man who is willing to be shot for his belief in a miracle would have doubted, had he been present at the miracle itself.

It is too bad if you have to do everything upon reflection and can't do anything from early habit.

Reading means borrowing.

All mathematical laws which we find in Nature are always suspect to me, in spite of their beauty. They give me no pleasure. They are merely auxiliaries. At close range it is all not true.

In every man there is something of all men.