大般涅槃經義記 9.2

9.2

下次廣上佛境不思。境謂涅槃，隨化示滅，實德常存；實德雖存，妙寂離相，故曰不思。斯德難彰，今寄化滅趣入以顯，欲使眾生學佛捨相趣入其中。於中有四：一寄滅處顯真涅槃、二寄滅時顯真涅槃、三寄嚴林顯真涅槃、四寄滅身以顯證入。

Next is to extensively elaborate on the inconceivability of the Buddha's realm above. 'Realm' refers to nirvāṇa: manifesting extinction in accord with transformation, its real virtues eternally abide; although its real virtues eternally abide, it is wondrously quiescent and free of marks, and hence is called inconceivable. These virtues are difficult to display; now, by resorting to entering through transformed extinction, they are revealed, desiring to cause sentient beings to emulate the Buddha in relinquishing marks and entering into it. In this there are four [parts]: first, relying on the place of extinction to reveal true nirvāṇa; second, relying on the time of extinction to reveal true nirvāṇa; third, relying on the adorned forest to reveal true nirvāṇa; fourth, relying on the extinct body to reveal the realization and entry.