金剛經纂要刊定記 4.129

4.129

住異下。釋三相義。以前標四相，此偈唯三者，以生在過去、滅屬未來，住異二種同處現在。又此二相不相捨離，即住而異即異而住，以同時處故合為一，恐濫常住但標異也。

Regarding "abiding and difference, etc.": explaining the meaning of the three marks. While four marks were indicated earlier, here the verse mentions only three because arising belongs to the past and cessation belongs to the future, whereas the two of abiding and difference dwell together in the present. Furthermore, these two marks do not part from each other: abiding is differing, and differing is abiding. Because they share the same time and place, they are combined into one; lest it be confused with permanent abiding, only difference is indicated.