The Scholarly Discourse and Academic Exchange of Noseo Yun Seon-geo at Sancheonjae in Geumsan

This study aims to examine the scholarly character of Noseo Yun Seon-geo (尹宣擧, 1610-1669), a prominent Confucian scholar of the late Joseon period, by analyzing his academic activities and intellectual exchanges at Sancheonjae (山泉齋) in Geumsan. Following the calamity of the Byeongja horan (the Qing Invasion of 1636), Yun Seon-geo withdrew to Geumsan, where he pursued not mere reclusion, but the cultivation of weijizhixue (爲己之學)－the pursuit of self-cultivation through learning－and sought to harmonize scholarly reflection with moral practice. Sancheonjae, the site where these ideals were fully realized, functioned as a sanctuary for his personal cultivation, a center for the instruction of disciples, and a hub for academic exchanges with fellow Giho sarim (畿湖士林) scholars. Yun Seon-geo inherited the intellectual legacy of Shindokjae Kim Jip (愼獨齋 金集), emphasizing the principle of silshim (實心)－the sincere and earnest mind in learning. He formed extensive intellectual ties with Giho sarim scholars such as Song Si-yeol (宋時烈), Song Jun-gil (宋浚吉), Lee Yu-tae (李惟泰), and Yu Gye (兪棨), establishing a network of academic solidarity. In 1644, Yun led a series of lectures on the Heart Classic (Simgyeong, 心經) at Sinansa (新安寺) on Mount Seodae, engaging in discussions on the practical application of gallye (家禮, family rituals), thereby playing a leading role in the scholarly activities of the Giho sarim. In particular, his collaborative compilation of Garye Wonryu (家禮源流) with Yu Gye laid the theoretical foundation for yehak (禮學, the study of rites), while simultaneously emphasizing the importance of integrating Confucian scholarship with ethical practice in everyday life. These academic exchanges and practical engagements served to consolidate the scholarly cohesion among the Giho sarim, with Yun Seon-geo playing a pivotal role in perpetuating and enriching the Giho intellectual tradition, in which scholarship and moral practice were inseparably linked. In addition to his scholarly exchanges, Yun Seon-geo devoted himself to the education of his disciples at Sancheonjae, nurturing figures such as Yun Jeung (尹拯), Yu Myeong-yun (兪命胤), Lee Sun-ak (李順岳), Choi Se-gyeong (崔世慶), and Park Se-hu (朴世垕). His educational approach combined rigorous scholarly inquiry with ethical cultivation, embodying a practice-oriented Confucian pedagogy. This pedagogical philosophy reflected the core Neo-Confucian view that learning is not confined to the accumulation of knowledge, but must ultimately lead to moral practice and social responsibility. In sum, Yun Seon-geo’s scholarly activities and academic exchanges at Sancheonjae exemplify the formation of academic solidarity, the transmission of Confucian scholarship, and the practical application of Neo-Confucian learning among the Giho sarim in the late Joseon period. Sancheonjae thus emerged not as a mere retreat, but as a comprehensive academic space where scholarly reflection, ethical practice, the nurturing of future generations, and intellectual fellowship converged. By closely examining Yun Seon-geo’s scholarly engagements at Sancheonjae, this study seeks to elucidate the academic significance and historical position of Sancheonjae lectures within the intellectual history of late Joseon Confucianism.