Unlike most other Japanese Confucians both before and after him, Ogyu categorically rejected Song Neo-Confucianism. His criticism of Song Neo-Confucianism cut to its core by rejecting the Four Books cannon upon which it was based, a cannon which had enjoyed wide-ranging acceptance across East Asia for the previous half millennium. The most significant implication of Ogyu's rejection of the Four Books was that by rejecting Mencius, a text which he saw as deeply flawed, he could reject one of the core ideas of Neo-Confucianism represented in the Mencius: the inherent goodness of human nature.Ogyu thereby emphasized the inherent diversity of the nature of the Way in historic practice, 'The Way of the Acient Kings is multi-faceted.' ... Copying the China of later imperial times was mistaken as they had already lost the Way of the ancient sage kings, notably through their abolition of the feudal order and its customs during the Han dynasty. Ogyu thus resolved the tension between Confuciansim and feudalism by recasting Confucianism as historically feudal.