大方廣圓覺修多羅了義經略疏 2.246

2.246

我體本無，唯心故有。心既念念無常，我亦念念生滅。故《淨名》云：「是身如電，念念不住故。」《論》云：「一切眾生不名為覺，以從本來念念相續，故說無始無明。」

The substance of the self is fundamentally non-existent; it exists solely because of the mind. Since the mind is impermanent from thought to thought, the self also arises and ceases thought by thought. Therefore the Vimalakīrtinirdeśa says: "This body is like lightning, for it does not abide thought by thought." The Treatise [on Awakening of Faith] says: "All sentient beings are not called enlightened, because from the beginning their thoughts have continued in succession; therefore it is called beginningless avidyā."