I believe that in spite of the recent triumphs of science, men haven't changed much in the last two thousand years; and in consequence we must still try to learn from history. History is ourselves.

Changes in the structure of society are not brought about solely by massive engines of doctrine. The first flash of insight which persuades human beings to change their basic assumptions is usually contained in a few phrases.

Those who wish, in the interest of morality, to reduce Leonardo, that inexhaustible source of creative power, to a neutral or sexless agency, have a strange idea of doing service to his reputation.

The Cathedrals were built to the glory of God; New York was built to the glory of Mammon.

Only the bad artists of the nineteenth century were frightened by the invention of photography; the good ones all welcomed it and used it.

The recognized achievements of some Negroes, despite rigid racial barriers, indicate that society by its prejudices may be depriving itself of valuable contributions from many others. It is now doubtful whether America can afford the luxury of such a waste of human resources.

All great civilisations, in their early stages, are based on success in war.