大般涅槃經集解 47.4

47.4

案僧亮曰：上說有為作因無常，涅槃從了因得則常。若爾者，十二部經皆是涅槃了因。即是經也，文深義奧，非二乘所聞也，聲聞緣覺經中，無闡提有佛性。所以重說此事者，欲發德王問也。

Sengliang notes: Above, it was said that conditioned productive causes are impermanent, while nirvāṇa is attained from a revealing cause and is therefore permanent. If so, the twelve divisions of the canon are all revealing causes of nirvāṇa. That is to say, in this sūtra, the text is profound and its meaning is esoteric, not what the two vehicles can hear; in the sūtras of the śrāvakas and pratyekabuddhas, there is no mention of icchantikas having the buddhadhātu. The reason this matter is spoken of again is to prompt the question from the Noble Virtue King.