成唯識論述記 4.411

4.411

述曰：第六意識恒常起時，逢境即緣，隨依即止，不同本識久住一依，定緣此境，不應冷觸由六漸生。由是等文下七識中，有一類計，第八識以五根為依，如此中言五識各別依不能執故，通依者能執。若不依根能執受者，第六應然；若不依不能執，便以第八為不定故，第八故以五根為依。及此中言不住身故，故第八識亦住於身。

The Commentary states: When the sixth mental consciousness constantly arises, it conditions whatever object it encounters and stops depending on whatever support it relies upon; it is unlike the root consciousness, which abides long in a single support and determinately conditions this object. Cold touch should not gradually arise due to the six. Because of such texts, among the seven consciousnesses below, there is one view positing that the eighth consciousness takes the five sense faculties as its basis; as it says here, because the five consciousnesses have distinct bases they cannot appropriate, whereas that with a common basis can appropriate. If one could appropriate without relying on the faculties, the sixth should do so; if not relying means unable to appropriate, then taking the eighth would be indeterminate, hence the eighth relies on the five faculties. And as it says here 'because it does not abide in the body', the eighth consciousness also abides in the body.