大方廣佛華嚴經隨疏演義鈔 60.88

60.88

疏「何者是無常，即前不住」者，不住是論，經即無常字。此問無常體相故、下經云「剎那」等故。疏「論云：依身轉時力生三種苦」者，內報遷移名身轉時。從觸生受，從受生苦，已是無常，況三苦更起，故是無常。由轉生苦，故轉為力。

Regarding the commentary's phrase "What is impermanent is precisely the preceding non-abiding": non-abiding is from the treatise, while the sūtra has the word "impermanent". This inquires into the essence and characteristics of impermanence, because the sūtra below says "instantaneous" and so forth. Regarding the commentary's phrase "The treatise states: Relying on the power of the body's changing phases, three kinds of suffering arise": the inner retribution's shifting is called "the body's changing phases". From contact, feeling arises; from feeling, suffering arises—this is already impermanence, not to mention that the three sufferings further arise; hence it is impermanence. Because suffering is generated through change, changing is the causal power.