成唯識論述記 10.598

10.598

述曰：別解「不思」。又，智微妙，性相甚深，所緣境自內證故。又，境微妙，唯甚深智能內證故。又，二皆通《攝論》唯有內證之言，唯解緣真如故。

The Commentary states: Distinctly explaining 'inconceivable [to thought]'. Moreover, wisdom is subtle and its nature and marks are profound, because the object it cognizes is personally realized within. Moreover, the object is subtle, because only profound wisdom can realize it within. Moreover, both apply; the statement in the Mahāyānasaṃgraha that it is only internally realized explains solely its cognizing of tathatā.