He claimed that such teachings of Fukusei (returning to human nature) was passed on from Koshi to Shishi, who summarized it into the 47 Volumes of the "Chuyo" (Doctrine of the Mean), and was passed on to Moshi, but was lost in the burning of books and burying of scholars in Qin, which led to the prospering of Taoism and Buddhism.
その復性の教えは孔子から伝えられて子思が『中庸』47篇にまとめ、孟子に伝えられたが、秦の焚書坑儒によって失われ、道教・仏教が隆盛するにいたったのだと主張している。