It is common," Alain de Botton writes in The Consolations of Philosophy, "to assume that we are dealing with a highly intelligent book when we cease to understand it. Profound ideas cannot, after all, be explained in the language of children." While his easygoing exploration of philosophers from Socrates to Nietzsche isn't exactly written for the Blue's Clues set, few readers will cease to understand it. Furthermore, it's a joy to read. De Botton's 1997 How Proust Can Change Your Life forged a new kind of lit crit: an exploration of Remembrance of Things Past, delivered in the sweet-gummed envelope of an advice book. He returns to the self-help format here, this time plundering the great thinkers to puzzle out the way we ought to live. What was stunning about the Proust book was de Botton's brazen annexing of a hallowed novelist to address lite emotional problems. That format is less arresting when applied to the philosophers, since which earnest philosophy major has not, from time to time, tried to apply the alpine heights of thought to his own humble worries? Usually, sophomoric attempts to turn to, say, Kant for advice on love tend to be unmitigated disasters. In de Botton's case, however, he is able to find consolation for a broken heart in Schopenhauer, consolation for inadequacy in Montaigne. Epicurus, usually associated with a love of luxury, is a solace for those of us without much money--and de Botton learns from him that "objects mim