法華義疏 8.76

8.76

或名究竟空、或名大涅槃、或名諸佛道也。然《中論．破涅槃品》正破四種涅槃：一、破有是涅槃，二、破空是涅槃，三、破亦空亦有，四、破非空非有，而後結云「涅槃絕於四句、超於百非，不知何以名之，強名為空也」。

It is alternately called ultimate emptiness, or the great nirvāṇa, or the path of all buddhas. Moreover, the 'Chapter on Refuting Nirvāṇa' in the Madhyamakaśāstra specifically refutes four kinds of nirvāṇa: first, refuting that existence is nirvāṇa; second, refuting that emptiness is nirvāṇa; third, refuting both emptiness and existence; and fourth, refuting neither emptiness nor existence. It then concludes by saying: 'Nirvāṇa is cut off from the four propositions and transcends the hundred negations; not knowing how to name it, it is provisionally designated as emptiness.'