成唯識論述記 7.391

7.391

述曰：舉心所以例心王，總名心所，雖無差別，即同心所類。其受、想等功能體類別者，即共許多心所得一念俱生，汝寧不許我心王眼、耳等異類一念俱起？

The Commentary states: Citing mental factors as an analogy for consciousness-kings: they are collectively called mental factors, and though undifferentiated in that sense, they belong to the same category of mental factors. Yet feeling, conception, and so forth, whose functions, entities, and kinds are distinct, are mutually granted to be capable of arising simultaneously in a single moment as multiple mental factors; why do you not grant that for us, the consciousness-kings of eye, ear, and so forth, which are of different kinds, arise simultaneously in a single moment?