He shortly concentrated on the Neo-Confucianism but came to investigate the theory of Katabutsu Chichi (Kakubutsu leads to maximal activation of wisdom) gradually under the influence of Yomei-gaku (neo-Confucianism based on teaching of Wang Yangming).
やがて朱子学に傾倒するが次第に陽明学の影響を受け、格物致知論を究明するようになる。