This book is about wisdom-the art of making good decisions. Learning how to make them is easy; all it takes is practice. Learning to make your own decisions routinely is hard; it requires you to form a new habit. To help break your old one, I will challenge “obvious truths” in various disciplines. These discussions are the subject matter of part II; they are interesting in their own right but are primarily intended to illustrate you must never merely accept arguments, even from purported experts, at face value. You need to take them with a grain of salt and do your own independent analysis in order to make good decisions, which always require accurate facts and reliable theories. Part III describes a useful and straightforward 12-step process for arriving at the best decision possible in any given set of circumstances.