It is also well known that he taught Confucianism to Norinaga MOTOORI (a famous scholar of the Japanese classics), who was staying in Kyoto to study, and Keichu's "Hyakunin isshu kaikan-sho" (Rectified Commentary on the One Hundred Waka Poems by One Hundred Poets) published by Keizan and Higuchi still remains today as one of the books collected by Suzuya (Norinaga's book collection).
京都に遊学していた本居宣長に儒学を教えた事でも知られており、景山と樋口が刊行した契沖の『百人一首改観抄』刊本の鈴屋蔵書（宣長の蔵書）が今日まで伝えられている。