大般涅槃經集解 21.43

21.43

案僧宗曰：此第二階，寄真應以明我無我也。至極法身無有憂悲；即我義。見有憂悲，似如無我也。借無想天以為況也，無想天報唯有四陰，不域其方所。雖無住處，要不得無也。近事尚難可知，況法身妙極耶？樹神依樹，亦如是也。智秀曰：廣門第二，明無我也。

Sengzong comments: This second tier relies on the true and response [bodies] to clarify self and non-self. The ultimate dharmakāya has no sorrow or grief; this is the meaning of self. Manifesting sorrow and grief resembles non-self. Drawing on the heaven of non-conception as an illustration: the retribution in the heaven of non-conception has only the four aggregates and does not delimit its location. Although having no dwelling place, it certainly cannot be non-existent. If an ordinary matter is still difficult to know, how much more so the wondrous ultimate of the dharmakāya? The tree deity relying on a tree is also like this. Zhixiu comments: The second in the broad gate clarifies non-self.