瑜伽師地論略纂 4.128

4.128

「即此業用，及於各別所行境中，如其所應所有業用」等者，《對法論》說：謂無明支有二種業，一、令諸有情於有愚癡；二、與行為緣。乃至生有二種業：一、令諸有情名色等起；二、與老死作緣。如是諸支皆有二業，其彼第二業，即此業用，上來所說三種緣是；及於各別生境中所有業者，即彼初業是。彼說：老死亦有二業：一、數令有情時分變異，壞少減故；二、數令有情壽命變異，壞壽命故。此中唯說前支與後為緣，故無老死緣，不相違也。

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.