He also achieved greatness in fukko Shinto (reform of the Ancient Shinto (prominent eighteenth century form of Shinto, based on the classics, and free from Confucian and Buddhist influences)) (classical study) and he is recognized as one of shiushi (four major people) in the study of Japanese classical literature, along with KADA no Azumamaro, KAMO no Mabuchi and Norinaga MOTOORI.
復古神道(古道学)の大成者であり、荷田春満、賀茂真淵、本居宣長とともに国学四大人（うし）の中の一人として位置付けられている。