瑜伽師地論略纂 16.49

16.49

有心地中云「譬如水浪依止暴流，或如影像依止明鏡」者，如五十一說二解等，勝義諦故，八識一體，如浪不離水；世俗諦故，八識各別，浪用殊故。如《攝論》二師義，以此文為證大師義。

In the bhūmi with mental activity, it states: 'Just as waves depend on a rushing torrent, or just as mirror-images depend on a clear mirror.' As the two explanations in the fifty-first [fascicle] state, from the standpoint of the ultimate truth, the eight consciousnesses are of one substance, just as waves are not separate from the water; from the standpoint of conventional truth, the eight consciousnesses are distinct, because the functions of the waves are different. As with the positions of the two masters in the Mahāyānasaṃgraha, this passage is used as proof for the Great Master's doctrine.