肇論新疏 3.16

3.16

一日遇蒙答安城侯姚嵩書問無為宗極。何者？夫眾生所以久流轉生死者，皆由著欲故也。若欲止於心，則無復生死。既無生死，潛神玄默，與虛空合其德，是名涅槃矣。既曰涅槃，復何容有名於其間哉！

One day I happened to receive your letter answering the Marquis of Ancheng, Yao Song, inquiring about the ultimate principle of the unconditioned. Why so? The reason sentient beings have long transmigrated in saṃsāra is entirely due to their attachment to desire. If desire ceases in the mind, then there is no longer saṃsāra. Saṃsāra being no more, one submerges the spirit in mysterious silence and joins its virtue with empty space; this is called nirvāṇa. Since it is called nirvāṇa, how could there further be room for names within it?