I have found the missing link between the higher ape and civilized man; it is we.

Barking dogs may occasionally bite, but laughing men hardly ever shoot!

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.

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

We do not take humor seriously enough.

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.

The instinctive need to be the member of a closely knit group fighting for common ideals may grow so strong that it becomes inessential what these ideals are.