肇論新疏 3.72

3.72

經稱有餘涅槃、無餘涅槃者，蓋是返本之真名、神道之妙稱者也。請試陳（布張）之。

That the sūtras speak of nirvāṇa with remainder and nirvāṇa without remainder is surely the true designation for returning to the source, the wondrous title of the spiritual Way. I beg leave to set this forth.