大乘起信論裂網疏 2.6

2.6

此中顯示實義者，依於一心有二種門，所謂心真如門、心生滅門。此二種門各攝一切法，以此展轉不相離故。

"Here, revealing the true meaning: relying on the one mind there are two aspects: namely, the aspect of the mind as tathatā, and the aspect of the mind as arising and ceasing. These two aspects each encompass all dharmas, because they are mutually inseparable."