In addition, he extended the earlier research on Japanese classics and, influenced by the Sung Study, lectured on Unity of the Three Creeds of Shinto, Buddhism, and Confucianism from his stance on one aspect of Rationalism.
また、古典では従来の研究を集大成し、宋学の影響を受け、一種の合理主義的な立場から、神仏儒教の三教一致を説いた。