法華玄義釋籤 16.26

16.26

初印中說五眾，第二印中說一切皆無我，第三印是果故名寂滅。若說無常，破外五欲之我所也。若說無我，破於內我。我我所破，故是寂滅涅槃。行者觀於無常，便生厭離，既厭苦已存著能觀，故有第二無我觀也。推求能觀至不可得，是一切法無所依止，但歸寂滅，以是義故，說寂滅印也。

In the first seal, the five aggregates are spoken of; in the second seal, it is said that all are without self; the third seal is the fruit, and hence is called quiescent extinction. If one speaks of impermanence, it shatters the external "what belongs to self" of the five desires. If one speaks of non-self, it shatters the internal self. Self and what belongs to self being shattered, it is therefore quiescent extinction, nirvāṇa. When the practitioner contemplates impermanence, revulsion and detachment immediately arise; having already become revulsed by suffering, one clings to that which contemplates, and therefore there is the second contemplation of non-self. Searching for that which contemplates until it cannot be found—this is all dharmas having nothing upon which to depend, merely returning to quiescent extinction; for this reason, the seal of quiescent extinction is spoken of.