大般涅槃經集解 19.1

19.1

雪山一味藥譬　釋佛性五陰中而無失壞　釋方等經如甘露毒藥　廣論三種三歸：一者階梯、二者一體、三者自身未來佛性

The Metaphor of the Single-Flavored Medicine of the Snow Mountains; Explaining that the Buddhadhātu is Within the Five Aggregates Without Being Lost or Destroyed; Explaining that the Vaipulya Sūtras Are Like Nectar and Poison; Broadly Discussing the Three Kinds of Threefold Refuge: First, the Gradual Stages; Second, the Single Substance; Third, the Future Buddhadhātu of One's Own Body.