大般涅槃經集解 56.82

56.82

案僧亮曰：第三難，性常不應有初也。寶亮曰：既有初發者，則未發心時無佛性。若爾，便是用發心善作佛性，云何言眾生悉有耶？

Sengliang states: The third objection: if the nature is permanent, it ought not to have a beginning. Baoliang states: Since there is an initial resolve, then prior to the resolve there is no buddhadhātu. If so, then it is the good of the resolve that serves as the buddhadhātu; why then say that all sentient beings possess it?