淨名經集解關中疏 2.259

2.259

善意菩薩曰。生死涅槃為二。若見生死性則無生死。無縛無解不然不滅。如是解者。是為入不二法門　受後有生死也。滅盡後有涅槃也。悟世生死妄無生死也。肇曰。縛然生死。死別名解滅。涅槃之異稱也。

The Bodhisattva Sumati said, "Saṃsāra and nirvāṇa constitute duality. If one sees the nature of saṃsāra, then there is no saṃsāra, neither bondage nor liberation, neither burning nor extinction. One who understands in this way enters the dharma gate of non-duality."
Receiving future existence is saṃsāra; the complete extinction of future existence is nirvāṇa. Realizing that the saṃsāra of the world is delusion means there is no saṃsāra. Sengzhao says, "Bondage and burning are saṃsāra; liberation and extinction are alternative names for nirvāṇa."