大般涅槃經集解 39.114

39.114

案僧亮曰：以苦行等為道，是則無常。以空為道，是則常也。菩薩少見佛性，得名為常。外道伏結，以還生故，故名無常。僧宗曰：先釋常必在佛，以有煩惱䨱故不能得見，得見之日非始有也。寶亮曰：道若無常，云何能令行人斷惑成聖耶？

Sengliang says: Taking ascetic practices and the like as the path, it is impermanent. Taking emptiness as the path, it is permanent. A bodhisattva slightly sees the buddhadhātu, gaining the name 'permanent'. Non-Buddhists subdue fetters, but because they arise again, it is called impermanent. Sengzong says: He first explains that permanence must reside in the Buddha; because it is covered by afflictions, one cannot see it; the day one sees it, it does not newly come to exist. Baoliang says: If the path were impermanent, how could it enable practitioners to sever delusions and become noble ones?