Sixty years ago I knew everything. Now I know nothing. Education is a progressive discovery of our own ignorance.

Underneath all civilization, ancient or modern, moved and still moves a sea of magic, superstition, and sorcery. Perhaps they will remain when the works of our reason have passed away.

If a man is fortunate he will, before he dies, gather up as much as he can of his civilized heritage and transmit it to his children.

A great civilization is not conquered from without, until it has destroyed itself from within. The essential causes of Rome's decline lay in her people, her morals, her class struggle, her failing trade, her bureaucratic despotism, her stifling taxes, her consuming wars.

If our economy of freedom fails to distribute wealth as ably as it has created it, the road to dictatorship will be open to any man who can persuasively promise security to all.

Communism is the opiate of the people.

Inquiry is fatal to certainty.