起信論註 1.9

1.9

論云何為二一者心真如門。二者心生滅門　述曰。此列二門也。即體絕相名真如門。隨緣變動名生滅門。體雖無別而義有異。約義異故。故說為門（答。真如生滅舉體則是一義。若舉生滅則有二門。故說為門）。

[Treatise:] What are the two? The first is the aspect of the mind as tathatā; the second is the aspect of the mind as arising and ceasing. [Commentary:] This lists the two aspects. That which is identical to the essence and transcends marks is called the aspect of tathatā; that which changes and moves following conditions is called the aspect of arising and ceasing. Although the essence has no difference, their meanings differ. Because of the difference in meaning, they are spoken of as "aspects". (Answer: Tathatā and arising and ceasing, in their entirety, are of one meaning. If arising and ceasing are taken, there are two aspects; hence they are spoken of as aspects.)