成唯識論掌中樞要 2.228

2.228

無性無常，《對法》等苦諦無常行皆有此行。初除所執，次觀依他故。亦可性、諦俱實。

Impermanence of non-intrinsic nature: in the *Abhidharma* and other texts, the practice of the impermanence of the truth of suffering all contains this practice. This is because one first eliminates the imagined, and next contemplates the dependent. Alternatively, nature and truth may both be real.