大般涅槃經集解 2.13

2.13

案法瑤曰：將顯法身自在，有大我之力也，兼遣封我之患。

I note that Fayao says: "This is intended to manifest the sovereignty of the dharmakāya, which has the power of the great ātman, while concurrently dispelling the affliction of attaching to a self."