瑜伽論記 17.412

17.412

前中，言不淨有三相等者，景云：糞穢相者，觀在胎時住處不淨，謂在生藏之下熟藏之上。彼等流相者，父母遺體是種子不淨，從彼而生彼等流相。能依所依差別相者，則是三十六物互相依託自體不淨。

In the former part, as for 'impurity has three marks,' etc., Jing says: The mark of excrement and filth means contemplating the impurity of the dwelling place while in the womb, which is below the stomach and above the intestines. The mark of being its outflow means the remnants of the parents' bodies are the impurity of the seed, from which one is born; this is the mark of being its outflow. The distinct marks of the supported and the supporting are the thirty-six bodily components relying upon one another, whose own entities are impure.