大般涅槃經集解 30.20

30.20

案僧亮曰：第四，向舉善因，今舉六觸即是善果，且以樂因而得樂果，云何無樂耶？寶亮曰：第四難，如樹伽於人中受天報，故知六根所對無不樂也。

Sengliang comments: Fourth: just before he raised the wholesome cause, now he cites the six contacts, which are the wholesome fruit; moreover, having obtained a pleasant fruit from a pleasant cause, how could there be no pleasure? Baoliang says: In the fourth objection, just as Śuka received a heavenly retribution among humans, we know that what the six sense faculties encounter is never without pleasure.