大般涅槃經義記 7.363

7.363

第三問中，執惑斷處，身之與智即為涅槃，難破向前涅槃如空，無有住處。「若斷非者」，逆取佛意，恐佛被徵，說惑斷處身非涅槃，故舉難之。「何故如來昔告生名我今此身即是涅槃」舉說以徵，昔說身是，云何上言涅槃如空，無有住處？

In the third question, he clings to the body and wisdom at the place where delusions are severed being precisely nirvāṇa, raising an objection to refute the earlier [statement that] nirvāṇa is like space, having no dwelling place. "If severance is not it" anticipates the Buddha's intention, fearing that when questioned, the Buddha might say that the body at the place where delusions are severed is not nirvāṇa, and therefore raises an objection against it. "Why did the Tathāgata formerly tell Jātismara: 'My present body is precisely nirvāṇa'?" cites the teaching to question him: if he formerly said the body is it, how could it be said above that nirvāṇa is like space, having no dwelling place?