”Tian ren he de” or ”tian ren he yi” are the ultimate concerns of Confucian ethical philosophy, which concretely demonstrates the fact that Confucian realm is defined by virtue as its content. ”A person who is considered great has virtue comparable to the heaven and earth” represents the character rationality of Yi Chuan philosophy. Therefore, using ”tian ren he de” as a starting point to Yi Chuan philosophy can completely and fully interpret all aspects of the discourse on the way of heaven, life, method, and realm of Yi Chuan. The ”tian” of ”tian ren he de” refers to the content of the way of heaven, and ”ren” refers to the content of the discourse on life and theory of method. Finally, ”tian ren he de” also represents the manifestation of Yi Chuan's theory of the realm.