Particularly, he pointed out that thought of Koshinto (as practiced prior to the introduction of Confucianism and Buddhism to Japan) such as 'kiyome' (purification) and 'harae' (purification) was assumed by onmyodo for over a thousand years after Emperor Temmu, then, returned to Shinto after Meiji restoration.
とりわけ、古神道の「清め」「祓え」の思想が、天武天皇以後、明治維新まで千数百年にわたって陰陽道によって担われ、維新以後ふたたび神道に戻ったことを指摘。