瑜伽師地論略纂 4.128

4.128

Regarding "This very karmic activity, as well as the respective karmic activities appropriate to their distinct objective realms...": The Abhidharmasamuccaya states that the link of ignorance has two kinds of activity: 1. causing sentient beings to be deluded regarding existence; 2. serving as a condition for formations. And so on up to birth having two kinds of activity: 1. causing name-and-form and so forth to arise for sentient beings; 2. serving as a condition for aging-and-death. In this way, each of the links has two activities. Its second activity is precisely "this karmic activity," which refers to the three kinds of conditions spoken of above. "The activities in their distinct realms of arising" are precisely its first activity. That text states: aging-and-death also has two activities: 1. repeatedly causing sentient beings' temporal periods to mutate, destroying youthfulness; 2. repeatedly causing sentient beings' life spans to mutate, destroying life span. Here, it speaks only of an earlier link serving as a condition for a later one, so there is no condition for aging-and-death; there is no contradiction.