大般涅槃經義記 5.314

5.314

「復以器」下答上第二、三緣之難，隨彼三緣應說為三，但以器別，故說為四。受化之人名之為器，「復以器故，應名為四」總以標舉。「器若有慈，則不得有悲、喜、捨心」別以顯之。無樂眾生是慈之器、有苦眾生是悲之器、得樂眾生是喜之器、究竟解脫是捨之器，於彼器中應生慈處則不得生悲、喜、捨心，餘亦如是。「以是」下結。

From "Furthermore, on account of the vessels" downward answers the second and third objections regarding the conditions above: according to those three conditions they should be spoken of as three, but because the vessels differ, they are spoken of as four. The persons who receive transformation are called "vessels"; "Furthermore, on account of the vessels they should be called four" indicates this generally. "If a vessel has benevolence, it cannot have compassion, sympathetic joy, or equanimity" reveals this specifically. Sentient beings without happiness are the vessels of benevolence; sentient beings with suffering are the vessels of compassion; sentient beings who have attained happiness are the vessels of sympathetic joy; and those of ultimate liberation are the vessels of equanimity. Where benevolence should arise toward that vessel, compassion, sympathetic joy, and equanimity cannot arise; the rest are likewise. From "for this reason" downward concludes.