“I believe I've found the missing link between animal and civilized man. It is us.”

“Barking dogs occasionally bite, but laughing men hardly ever shoot.”

“Every man gets a narrower and narrower field of knowledge in which he must be an expert in order to compete with other people. The specialist knows more and more about less and less and finally knows everything about nothing.”

“'I don't need brains,' says the billionaire contemptuously. 'I'm brainy enough myself!' The broker cries out in desperation, 'What, in heaven's name, do you want?' 'Goodness,' is the answer.”

“We do not take humor seriously enough.”

“I believe I've found the missing link between animal and civilized man. It is us.”

“There is no faith which has never yet been broken, except that of a truly faithful dog”

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

“Philosophers are people who know less and less about more and more, until they know nothing about everything. Scientists are people who know more and more about less and less, until they know everything about nothing.”

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

“Historians will have to face the fact that natural selection determined the evolution of cultures in the same manner as it did that of species.”