We normally think of history as one catastrophe after another, war followed by war, outrage by outrage - almost as if history were nothing more than all the narratives of human pain, assembled in sequence. And surely this is, often enough, an adequate description. But history is also the narratives of grace, the recountings of those blessed and inexplicable moments when someone did something for someone else, saved a life, bestowed a gift, gave something beyond what was required by circumstance.