“Societies may die a violent death, like the Inca and Aztec societies which the Spaniards destroyed with gunpowder in the sixteenth century; and it is sometimes thought by people who have been reading historical thrillers that the Roman Empire died in the same way, at the hands of barbarian invaders. That theory is amusing but untrue. It died of disease, not of violence, and the disease was a long-growing and deep-seated conviction that its own way of life was not worth preserving.”
