Yi Hwang (1501-1570), better known by his pen name T'oegye, is generally considered Korea's preeminent Neo-Confucian scholar. The Ten Diagrams on Sage Learning is his final masterpiece, a distillation of the learning and practice of a lifetime, and one of the most important works of Korean Neo-Confucianism. In it he crystallized the essence of Neo-Confucian philosophy and spiritual practice in ten brief chapters that begin with the grand vision of the universe and conclude with a description of a well-lived day. In To Become a Sage, Michael Kalton supplements a superb...