Although he was called 'an officer with good knowledge of Confucianism' in "Fuso Ryakki" (A Brief History of Japan), he in fact had profound knowledge not only of Confucianism and history but also of 3 fields of Xuanxue (Neotaoism) that were "Shueki," "Roshidotokukyo," and "Soshi," and therefore, he had very good knowledge of yin-yang philosophy.
『扶桑略記』には「在朝の通儒」と評されたが、儒教や歴史のみならず、『周易』・『老子道徳経』・『荘子』の三玄の学に通じて、陰陽道に対する造詣が深かった。