The very old can tell you about peace. They have fought through the black, sinking, visceral knowledge of death–their own death–that heralds middle age and come to the place where childhood meets them once more, and with it that ineffable treasure that only the very young and old know: the tranquility of the moment. The contentment of living each day as it comes to them, wholly and with all senses. The young do it because they know nothing, yet, of pain and fear and the transience of their lives; the old because they know everything of those things and can bear them only by staying in the moment. Carpe diem> may be the sum of all the world's wisdom. I have always thought Horace must have been old when he wrote it.