But thy eternal summer shall not fade
Nor lose possession of that fair thou owest;Nor shall Death brag thou wander'st in his shade,
-- Sonnet 18In the end, it is not our failure to learn from history that condemns us to repeat it, but our mind's turning away from even the briefest glimpse of what the dark passages of history were like that damns us. We may know, but we refuse to see. We blind our own mind's eye. It is our inability to imagine the most evil things that all men are...