This book is about the reflection of Tang Yijie, a master of Chinese classics, on traditional Chinese culture and philosophy. Mr. Tang focused on the theory of "unity of man and nature", "unity of knowledge and practice" and "unity of situation", corresponding to the common sense of the three values, which are truth, goodness and beauty. The book presents Mr. Tang's comprehensive thinking on the modern significance of Chinese traditional culture and the basic spirit of Chinese philosophy. The three aspects of Chinese traditional philosophy theory, including universal life theory, realm cultivation theory and political education theory, are closely related to the three "oneness" as the basic philosophical proposition. Mr. Tang summed all these up as: the concept of universal harmony, the spirit of inner transcendence, the way of inner sanctity and outer kingship.