大般涅槃經義記 6.26

6.26

「無為空」中，先問，次辯，後總結之。辯中，「無為悉皆是空」總以標舉。「所謂」下別，別中三義備如上辯：一無為空中無有橫計眾生、壽命、常樂我淨，是中未空無為法體；二於此空中無內外事及有為法；三於此空中無佛、法、僧及與佛性義。

In 'unconditioned emptiness', it first asks, next explains, and finally summarizes and concludes. In the explanation, 'the unconditioned are all empty' generally marks it out. From 'Namely' below is the specific; in the specific there are three meanings, fully as explained above: first, within unconditioned emptiness there are no arbitrarily conceptualized sentient beings, life-spans, permanence, bliss, self, or purity—herein the substantial entity of unconditioned dharmas is not yet emptied; second, within this emptiness there are no internal or external affairs, nor conditioned dharmas; third, within this emptiness there is the meaning of the absence of Buddha, Dharma, Saṅgha, and buddha-nature.