宗鏡錄 51.37

51.37

答。設大乘許後五三亦不離眼識。免犯不定。便違自宗。大乘宗說後五三定離眼識故。故置初三攝半因。遮後五三非初三攝故。

Answer: If the Mahāyāna were to accept that the subsequent five sets of three are also not separate from visual consciousness, while avoiding the fallacy of inconclusiveness, it would contradict its own school's tenets, because the Mahāyāna school maintains that the subsequent five sets of three are definitely separate from visual consciousness. Therefore, half of the reason, "subsumed under the first three," is posited to exclude the subsequent five sets of three from being subsumed under the first three.