成唯識論了義燈 5.231

5.231

心遠獨行者，《攝論》既云：無第二故名為獨行，似依一意識義釋。准引此難，不唯依經部。

Regarding "the mind far-traveling and acting alone": Since the *Mahāyānasaṃgraha* says, "Because there is no second, it is called acting alone," this seems to be explained based on the doctrine of a single mental consciousness. Inferring from the citation of this objection, it does not rely solely on the Sautrāntikas.