大方廣佛華嚴經隨疏演義鈔 60.91

60.91

疏「然無常有二種」者，遠公云：「應有三種：一分段無常。分段兩向用之，向前為無常所以，今此為無常體性，故此分段不出此二。少時亦名念念無常，故次經云『剎那生滅，四相遷故。』」

Regarding the commentary's phrase "However, there are two kinds of impermanence": Master Huiyuan says: "There should be three kinds: 1. impermanence of mortal embodiment. Mortal embodiment is used in two ways: pointing forward, it is the reason for impermanence; here, it is the essential nature of impermanence. Thus this mortal embodiment does not go beyond these two. A brief duration is also called moment-to-moment impermanence; hence the subsequent sūtra says: 'Arising and ceasing in an instant, changing according to the four characteristics.'"