The “touchstones of goodness,” the philosopher king Marcus Aurelius called them. To millions, they’re known as the cardinal virtues, four near-universal ideals adopted by Christianity and most of Western philosophy, but equally valued in Buddhism, Hinduism, and just about every other philosophy you can imagine. They’re called “cardinal,” C. S. Lewis pointed out, not because they come down from church authorities but because they originate from the Latin cardo, or hinge.
