Dasan`s philosophic views well reflected in his explanations on The Middle Way (中庸) and other Classics are primarily concerned with the original spirit of Confucianism and its practical aspects in a real life, not confining himself to the doctrines of The Principle of Human Nature (性理學). His main focuses of annotations of Classics were on recovering morality and practice in daily lives. As regards the religious nature of his philosophy, he put much emphasis on worshipping The Supreme Being and maintaining respectful mind for Him in real events. Outgrowing too idealistic aspects of The Principle of Human Nature, he made himself clear on the re-definition of Goodness (善) which the subjective individual can do following his original nature. Sloughing off Chu-Tzu`s ideal doctrines, he`s always holding on to the idea of Sincerity (誠) in the course of one`s lifetime. Although he showed a marked trend toward the proper function of Confucius & Mencius`s Learning, he didn`t hang on to it, taking strides to a creative sphere of his scholarship especially in recovering the original faces of The Middle Way in his works. We can naturally extract the necessity to build a whole personality from his philosophy, for he renovated the human dignity inclined to be disregarded in the traditional Korean ethics.