大方廣圓覺修多羅了義經略疏 1.723

1.723

正顯也。顯圓覺性本淨圓明，獨體全真，不因修得。眾幻雖滅，自性常存，不假緣生，故云非幻。《金剛三昧經》云：「若得空心，心不幻化。」然對前妄盡釋云真如，若以本宗但名圓覺。

This directly reveals it. It reveals that the nature of perfect enlightenment is fundamentally pure, perfect, and luminous, a solitary substance that is entirely true, not obtained through cultivation. Although the multitude of illusions cease, the intrinsic nature always remains, not relying on conditions to arise; hence it is called 'not illusory.' The Vajrasamādhi-sūtra states: 'If one attains the empty mind, the mind is not an illusion.' However, in contrast to the exhaustion of prior delusion it is explained as tathatā, while in terms of this school it is simply called perfect enlightenment.