俱舍論記 10.58

10.58

「雖有根境至便成無用」者，牒外救破。外救意云：亦有根、境不能發識，是故經中別說根、境。如何難我離觸之外無別有三？故牒破云：雖有根、境不發於識，而無有識不託根、境。言三可以攝觸，更別說觸便成無用。

"Although there are faculty and object [...] it would become useless": this takes up the opponent's defense and refutes it. The opponent's meaning is: There are also faculties and objects that cannot produce consciousness, and for that reason the sūtra speaks of faculty and object separately; how can you challenge me saying that apart from contact there are no three distinct [dharmas]? Therefore, taking this up to refute it, it says: Although there are faculties and objects that do not produce consciousness, there is no consciousness that does not rely on a faculty and object. Stating the three could already subsume contact; to speak of contact separately would become completely useless.