瑜伽論記 24.97

24.97

九、又由七行已下，解觀察。於諸受中，觀受七相中，第二受因，釋中開為三種，謂現在流轉還滅因緣，當來別觀流轉為一，還滅為一，故成七相。

Ninth, from "Furthermore, by means of seven aspects" downward, it explains observation. Within "among feelings, observing the seven characteristics of feeling," the second, the causes of feeling, is opened in the commentary into three kinds: namely, the present causes and conditions of saṃsāra and cessation, while for the future one separately observes saṃsāra as one and cessation as one; thus they constitute seven characteristics.