Refuting Neo-Confucianism as 'just a delusional theory based on hypothesis', he criticized the interpretation of classical writings based on Neo-Confucianism, and established Kobunjigaku (study of ancient rhetoric school) (the Kenengaku school) as a method for deciphering classical writings of ancient China.
朱子学を「憶測にもとづく虚妄の説にすぎない」と喝破、朱子学に立脚した古典解釈を批判し、古代中国の古典を読み解く方法論としての古文辞学（蘐園学派）を確立した。