If there were only two men in the world, how would they get on? They would help one another, harm one another, flatter one another, slander one another, fight one another, make it up; they could neither live together nor do without one another. They would act just as all men do today. They possess the gift of reason — yes — but they also possess the gift of instinct; and they will feel, and reason, and act always as nature has destined them to do.

— Voltaire, Dictionnaire philosophique, 1764