成唯識論述記 10.478

10.478

述曰：第三，總結。以三涅槃名所顯得，以自性涅槃不由顯故方得，本來寂故，唯有後三名所顯得，障滅顯故。

The Commentary states: Third, the general conclusion. The three nirvāṇas are called 'attainment by disclosure'. Because the naturally pure nirvāṇa is not attained by being disclosed—since it is fundamentally tranquil—only the latter three are called 'attainment by disclosure', because they are disclosed through the eradication of obstacles.