成唯識論述記 5.822

5.822

述曰：此結。五、六不定同性，定中意是善，與耳性不同，亦俱生故。以定中不同，證在散位俱有五者不定同性。若爾，何故《解深密經》及七十六說：五識同時意識同緣？

The Commentary states: This is the conclusion. The fifth and sixth [consciousnesses] are not determinately of the same nature; within concentration, the mental consciousness is wholesome, whereas it differs in nature from the ear[-consciousness], yet they also arise together. Because they are not identical within concentration, this proves that in the distracted state, when the five exist together, they are not determinately of the same nature. If so, why do the Saṃdhinirmocana-sūtra and fascicle seventy-six state that the simultaneous mental consciousness takes the same cognitive object as the five consciousnesses?