I believe that present day civilized man suffers from insufficient discharge of his aggressive drive

More than any other product of human scientific culture scientific knowledge is the collective property of all mankind.

All scientific knowledge to which man owes his role as master of the world arose from playful activities.

The fidelity of a dog is a precious gift demanding no less binding moral responsibilities than the friendship of a human being.

A man sufficiently gifted with humor is in small danger of succumbing to flattering delusions about himself, because he cannot help perceiving what a pompous ass he would become if he did.

Scientific truth is universal, because it is only discovered by the human brain and not made by it, as art is.

I see the creative accomplishments of which highly gifted humans are capable as special cases of the universal creative process, that game played by everyone against everyone else, from which wells up all that has never been before.