維摩經玄疏 2.102

2.102

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.