▁above ▁all ▁for ▁his ▁work ▁in ▁synth es izing ▁the ▁Ne o - Conf u cian ▁thought ▁of ▁the ▁middle ▁Jose on ▁dynast y . ▁ ▁In ▁the ▁process , ▁he ▁wrote ▁widely ▁in ▁various ▁fields ▁including ▁law , ▁political ▁theory , ▁and ▁the ▁Korean ▁Conf u cian ▁class ics . ▁He ▁sought ▁to ▁return ▁Korean ▁Conf u cian ▁scholar ship ▁to ▁a ▁direct ▁connection ▁with ▁the ▁original ▁thought ▁of ▁Conf u cius . ▁He ▁called ▁this ▁return ▁to ▁the ▁class ics ▁" S usa " ▁learning ▁( 수 사 , ▁ <0xE6> <0xB4> <0x99> <0xE6> <0xB3> <0x97> ), ▁a ▁reference ▁to ▁the ▁two ▁rivers ▁that ▁flow ed ▁through ▁Conf u cius ' ▁hom eland . ▁ ▁Je ong ▁published ▁a ▁number ▁of ▁books ▁over ▁various ▁areas , ▁including ▁his ▁best - known ▁M ok m ins im se o ▁( 목 민 심 서 , ▁ <0xE7> <0x89> <0xA7> 民 心 書 , ▁The ▁Mind ▁of ▁G over ning ▁the ▁People ). ▁Although ▁he ▁was ▁deeply ▁concerned ▁about ▁the ▁problem ▁of ▁pover ty ▁during ▁that ▁time , ▁Je ong ▁deeply ▁p onder ed ▁the ▁issue ▁of ▁pover ty ▁and ▁raised ▁questions ▁about ▁the ▁role ▁of ▁government ▁officials . ▁He ▁believed ▁that ▁the ▁government ▁and ▁b ureau cr ats ▁could ▁and ▁should ▁play ▁a ▁major ▁role ▁in ▁solving ▁the ▁problem ▁of ▁pover ty . ▁Das an ▁str essed ▁the ▁importance ▁of ▁the ▁governor ' s ▁admin ister ing ▁the ▁people ▁with ▁integrity ▁and ▁in ▁a ▁fair ▁manner . ▁According ▁to ▁him , ▁the