大般涅槃經集解 66.74

66.74

案僧亮曰：草譬凡聖佛性也，牛譬後身菩薩也。牛食草即成醍醐，譬後身見性即成佛也。僧宗曰：以有現在煩惱，故不得覩，豈得言無耶？

Sengliang notes: "The grass is an analogy for the buddhadhātu of ordinary beings and sages; the cow is an analogy for the bodhisattva of the final existence. When the cow eats the grass, it turns into sarpirmaṇḍa, which is an analogy for seeing the nature in the final existence and immediately becoming a Buddha." Sengzong says: "Because there are present afflictions, they cannot behold it; how could one say it does not exist?"