首楞嚴義疏注經 8.180

8.180

應當遠離一切幻化虛妄境界，故云壞其可壞。心如幻者亦復遠離，遠離為幻亦復遠離，離遠離幻亦復遠離，故云遠離諸離。得無所離，即合涅槃，故云不壞迴向。

One should depart far from all illusory, false realms; hence it says 'destroying that which can be destroyed.' The mind that is like an illusion is also departed from; regarding departure as an illusion is also departed from; and departing from the illusion of departure is also departed from; hence it says 'departing far from all departures.' Attaining that which has nothing to depart from, one accords with nirvāṇa; hence it is called the 'indestructible dedication of merit.'