Who said “All civilization has from time to time become a thin crust over a volcano of revolution.”?

“Every new generation...is a fresh invasion of savages.”

“The three great elements of modern civilization, Gun powder, Printing, and the Protestant religion.”

“One might enumerate the items of high civilization, as it exists in other countries, which are absent from the texture of American life, until it should become a wonder to know what was left.”

“If Germany, thanks to Hitler and his successors, were to enslave the European nations and destroy most of the treasures of their past, future historians would certainly pronounce that she had civilized Europe.”

“People sometimes tell me that they prefer barbarism to civilization. I doubt if they have given it a long enough trial. Like the people of Alexandria, they are bored by civilization; but all the evidence suggests that the boredom of barbarism is infinitely greater.”

“To be a leader of men one must turn one's back on men.”

“A man must not swallow more beliefs than he can digest.”

“The Promised Land always lies on the other side of a Wilderness.”

“Thinking in its lower grades, is comparable to paper money, and in its higher forms it is a kind of poetry.”

“The sun and the moon and the stars would have disappeared long ago...had they happened to be within the reach of predatory human hands.”

“Dancing is the loftiest, the most moving, the most beautiful of the arts, because it is no mere translation or abstraction from life; it is life itself.”