維摩經玄疏 2.102

2.102

三、明證成者，若觀無明因緣，入不二法門，住不思議解脫也。故此經明入不二法門，即是中道，雙照二諦，自然流入薩婆若海。此是觀因緣即一實諦，不生不生，證無作四實諦。亦名一切種智，亦名佛眼，即是入初地，見佛性，住大涅槃也。

Third, explaining the verification and attainment: if one contemplates the causes and conditions of ignorance, one enters the non-dual dharma-door and abides in inconceivable liberation. Therefore, this sūtra's clarification of entering the non-dual dharma-door is precisely the middle way, doubly illuminating the two truths, naturally flowing into the ocean of sarvajñā. This is contemplating causes and conditions as being the one real truth, unarisen and unarising, realizing the unconditioned four real truths. It is also called the knowledge of all aspects and called the Buddha eye; this is entering the first ground, seeing the buddha-nature, and abiding in great nirvāṇa.