In his later works - "Jibong Jib" (Hangul: 지봉집) and "Chaesin Jamnok" (Hangul: 채신잡록)- he placed less emphasis on Confucianism and emphasized adopting western knowledge to strengthen the nation. His work also dealt with the subject of moderate political and economic reforms to improve the living standards of the peasants, which had deteriorated following the Seven-Year War, and the bureaucracy. He also implemented welfare policies, believing that the "Way of Heaven" was found among the people and the most noble endeavour was to feed and clothe the poor. His idea of a welfare state was inspired by both Confucianism and Catholicism. These books were stored in Changsu Seowon (Changsu Confucian Academy) in Suwon, Gyeonggi province.