維摩經玄疏 6.61

6.61

四、明圓教四門者，四門明入佛性第一義，一往與別教四門入第一義諦、見佛性、得常住涅槃，名義是同，細尋意趣有異。

Fourth, clarifying the four gates of the perfect teaching: the four gates clarify entering the supreme meaning of buddha-nature; provisionally, its names and meanings are the same as the distinctive teaching's four gates entering paramārtha-satya, seeing buddha-nature, and attaining eternally abiding nirvāṇa, but when examining the purport closely, there is a difference.