涅槃經遊意 1.67

1.67

又，彼義真諦中不得有樂，不得有一乘也；我、樂、一乘並是世諦；又，於汝證言生死無常，涅槃是常，大眾聞之何所悟？故云涅槃不可定常，不可定無常，非待非不待，不可思議，聞者悟也！

Furthermore, in their doctrine, within the ultimate truth there cannot be bliss, nor can there be the One Vehicle; self, bliss, and the One Vehicle are all conventional truth. Moreover, in your verification, you say saṃsāra is impermanent and nirvāṇa is permanent; hearing this, what do the assemblies awaken to? Therefore it is said: nirvāṇa cannot be definitely permanent, nor can it be definitely impermanent; it is neither relative nor non-relative; it is inconceivable—and those who hear this awaken!