大般涅槃經集解 18.175

18.175

案僧亮曰：上說眾生有我，我即佛性。夫有有二種，現在有、當來有也。而有義未分，須以十一事為難，以難現在之有，成當有之旨也。法瑤曰：家中寶藏，以譬眾生有大明真我，在其中矣。迦葉知眾有疑，乃設難云：便應已有果性之用。

Sengliang states: Above, it was explained that sentient beings have a self, and the self is precisely the buddhadhātu. Now, existence is of two kinds: present existence and future existence. Because the meaning of existence has not yet been distinguished, it is necessary to present eleven points of challenge, challenging present existence in order to establish the purport of future existence. Fayao states: The treasure storehouse within the house is an analogy for sentient beings possessing the greatly luminous true self within themselves. Kāśyapa, knowing that the assembly harboured doubts, raised challenges, saying that [sentient beings] ought then already to possess the functioning of the nature as fruit.