成唯識論述記 7.415

7.415

述曰：謂六、七、八識有寬狹，境不同故。設少分同者，眼識等彼此所依根體、數異故，謂五識依四，意識依三等，如前第四說。雖復想應由四義等，合以一義，便簡之盡，謂所依根體、數異。此所依根有二異：一、體異，眼等根體各別故；二、數異，四、三依別故，如依眼等五根之識，依體各異，互不相應，以共許不相應為例。此即第二別問答訖。第三總解能變一、異。

The Commentary states: This means that the sixth, seventh, and eighth vijñānas differ in breadth and narrowness, and their cognitive objects are not the same. Even if they are partially the same, the faculties (indriya) that serve as their respective supports differ in substance and number—namely, the five vijñānas rely on four, the mano-vijñāna relies on three, and so forth, as explained in the fourth [fascicle] above. Although association also depends on the four aspects and so forth, taking them together into a single criterion thoroughly differentiates them, namely, that the supporting faculties differ in substance and number. These supporting faculties have two differences: first, difference in substance, because the faculties of the eye and so forth each have a distinct substance; second, difference in number, because their reliance on four or three is distinct. Just as the vijñānas relying on the five faculties of the eye and so forth each have distinct supporting substances and are mutually unassociated, this serves as an example based on what is commonly accepted as unassociated. This concludes the second part, the specific questions and answers. The third part explains generally the identity and difference of the transforming [consciousnesses].