淨名經集解關中疏 2.262

2.262

電天菩薩曰。明無明為二。無明實性即是明。明亦不可取離一切數。於其中平等無二者。是為入不二法門　肇曰。明惠明也。無明癡冥也。見無明性即為是明。若見明為明即明無明相待故不可取。

The Bodhisattva Vidyuddeva said, "Illumination and ignorance constitute duality. The true nature of ignorance is itself illumination. Illumination also cannot be grasped, being free from all reckonings. To be equal and non-dual within this is entering the dharma gate of non-duality."
Sengzhao says, "Illumination is the clarity of wisdom; ignorance is the darkness of delusion. Seeing the nature of ignorance is itself illumination. If one sees illumination as illumination, then illumination and ignorance are mutually dependent, and thus it cannot be grasped."