成唯識論述記 7.727

7.727

述曰：眼等五識，八識之中最居前故，因中一者麁；二者鈍；三者劣故，必杖第八或第六所變外質方起，餘如《樞要》。得轉依位隨在何處，此疎所緣即不定有，或說亦緣真如；有說不得，但緣去、來等故。然今大乘至佛位已，一切皆所緣，唯除見分非相所緣，因中五識諸根互用，唯除相應自體，亦是所緣緣故。

The Commentary states: Because the five consciousnesses—eye and the others—are foremost among the eight consciousnesses, in the causal stage they are: first, coarse; second, dull; and third, inferior. Hence, they must rely on an external archetype transformed by either the eighth or the sixth [consciousness] in order to arise; the rest is as [explained in] the Shunyao. At the stage where the basis has been transformed, wherever they may be, this remote objective support is not definitely present. Some say they also take tathatā as an object; others say they cannot, taking only the past, future, and so on as objects. However, now in the Mahāyāna, once the Buddha stage is reached, all [dharmas] are taken as objects, with the sole exception that the seeing division is not the objective support for [another's] image; in the causal stage, the five consciousnesses share the mutual function of the sense faculties, and with the sole exception of their own associated entity, [all else] can also serve as the object-condition.