 teleological train of progress being developed, which sees this path from the collapse of antiquity, the Dark Ages through the Middle Ages, and then kind of the rebirth of learning and inquiry and free thinking, gaining momentum in the Renaissance and then reaching its pinnacle in the Enlightenment and the Age of Reason. And I think as a consequence of this, the problem of what brought the ancient world to ruin haunted many of the philosophers and historians of the Enlightenment.