“Man is a believing animal. We live by some of those beliefs, made plausible by the labors of the good and the great to embody them, and of the wise to explain how they have created a freer, more prosperous, more just, and more fulfilling life for mankind. But other beliefs, the stock-in-trade of the world’s deluded or power-hungry demagogues and charlatans, will kill us. Our nation’s fate depends on relearning the difference.”