維摩經玄疏 2.169

2.169

答曰：須彌入芥子，小不障大，大不閡小，故云不思議耳。今有煩惱結惑不障智慧涅槃，智慧涅槃不閡煩惱結惑，乃名不可思議。若其無惑有智，而入涅槃，稱不思議者，今即反難：亦應無小有大，論不思議也！

Answer: When Sumeru enters a mustard seed, the small does not hinder the large, and the large does not obstruct the small; therefore it is called inconceivable. Now, the presence of the fetters and delusions of defilement does not obstruct wisdom and nirvāṇa, and wisdom and nirvāṇa do not obstruct the fetters and delusions of defilement; this alone is called inconceivable. If it were a case of entering nirvāṇa with delusions absent and wisdom present being called inconceivable, one could counter by demanding: one should likewise speak of inconceivable where the small is absent and the large is present!