成唯識論述記 7.578

7.578

述曰：此論主解，且初返難。若唯有我一人之識，寧有十方凡聖、尊卑、因果等別？「等」者，等取色、心等別別法，無佛故，誰為我說？無眾生故，佛為誰說？無涅槃、菩提果故，有何法？無法故，我何所求？或無行，修何法？無涅槃等，何所求？故唯識言有深意趣，意趣如何？

The Commentary states: Here the author of the treatise explains, first presenting a counter-challenge. If there were only the consciousness of me, one person alone, how could there be distinctions such as ordinary beings and noble ones, superior and inferior, cause and effect across the ten directions? "Distinctions such as" includes various separate dharmas like form and mind. If there were no Buddhas, who would teach for me? If there were no sentient beings, for whom would the Buddha teach? If there were no fruits of nirvāṇa and bodhi, what dharmas would exist? If there were no dharmas, what would I seek? Or if there were no practice, what dharma would one cultivate? If there were no nirvāṇa and so forth, what would one seek? Therefore, the expression "consciousness-only" has a profound intended purport. What is that intended purport?