Abstract

Ki Jeong-jin is the one of the most famous Neo-Confucian theorists of the late Joseon Dynasty, and he is well known as a proposer of the theory of statements that there is only one Principle although the phenomena vary. He particularly emphasizes the role and authority of Principle. His arguments related to the theory were mainly raised in the work of Napryangsaeui. He, in this work, explicitly reveals the intention to resolve the issues of the nature of humans and things in the Ho-hak debate. But he has never directly participated in the debate. Instead, after his death, some debates over Napryangsaeui arose between his students and Jeon Woo. This paper aims to analyze Ki Jeong-jin’s theory by comparison with the view of Han Wonjin who represents the theory of nature of humans and things in the Ho-hak school, and with the issues of debate between Ki Jeong-jin’s students and Jeon Woo. Particularly, we focused on the matter of relation between ‘completeness and incompleteness’ and ‘original nature’. Through this analysis, we could expand the understanding of the aspects discussed in the theory on the similarities and differences in nature of humans and things, and the significance of Ki Jeong-jin’s theory. Furthermore, in the history of Neo-Confucianism in the Joseon Dynasty, we could shed light on the reconstruction process of the philosophical statements that there is only one Principle but the phenomena vary.