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For instance, Yak-yong Chung’s Igiron (Two Theories) emphasizes one of the Confucian virtues, gyeong Cheon ein, that is, “respect Heaven and love your neighbour.” Chung found that this concept is similar to Christian teaching, “love the Lord your God” and “love your neighbour as yourself.”44 Ik Yi saw that there is an affinity between Christianity and Confucianism on the issue of filial piety; for the fifth of the great commandments of the Torah states: “Honour your father and mother, so that your days may be long in the land that the Lord your God is giving you” (Exodus 20: 12).45 (...) Han-sun Chong’s work San’gi Sansu (sic) (Worshipping the Ruler Above) shows that the Ten Commandments are compatible with the Confucian Five Morals and Three Fundamentals, demonstrating that the indigenization of Christian ethics within a Korean Confucian context is possible.46Furthermore, Seonggyo Gonggwa (Textbook of Holy Catholic Doctrines) explores Catholic doctrines that reflect some Confucian aspects of Christianity. This book served as the spiritual guidebook of nearly every Catholic from the early eighteenth to the late nineteenth century. (...)

Korean Confucian scholars who converted to the Christian faith contributed to the development of both Roman Catholicism and Protestantism in Korea. Simply put, Korean Christian theology cannot be understood without a basic knowledge of Korean Confucianism.