It is surely one of the best –one of the most interesting and most important –questions in the history of human inquiry. It can be asked as plainly as we like, yet be disputed as fiercely as any, ever: Why do you believe what you do, and not something else? We can ask this question generally or specifically, grandly or trivially. It can, for instance, be about the origin of the universe or the fate of next season’s marigolds, the existence of God or the prospects for the Miami Hurricanes or the TottenhamHotspurs, the best treatment for breast cancer or the worst way to play bridge. The question.