This is a game that has been played over and over--in fact, for twenty-four centuries--before audiences of almost infinite variety. At some point long ago, the game became a doubles match, for the two Greek philosophers were joined by two medieval Christian theologians: Plato by Augustine of Hippo, who could nearly equal him in style and seriousness; Aristotle by Thomas Aquinas, nearly as styleless as Aristotle but, though overweight, ungainly, and blinking in the sun, extremely thoughtful and genial--the sort of athlete who is always undervalued.