大般涅槃經集解 56.114

56.114

案僧亮曰：如是四法皆悉是常者，眾生業性，三因一果，常故不可思議七也。僧宗曰：能如是者名不退，不爾者則為退矣。寶亮曰：舉三十二相業勸業。為用此義故，廣明退不退之相也。

Sengliang states: As for 'these four dharmas are all permanent', the karmic nature of sentient beings—three causes and one fruit—is permanent, and hence it is the seventh inconceivable. Sengzong states: One who can act thus is called non-retrogressing; one who cannot is retrogressing. Baoliang states: He adduces the karma of the thirty-two marks to encourage practice. It is for the sake of this meaning that he extensively clarifies the characteristics of retrogression and non-retrogression.