成唯識論述記 3.494

3.494

述曰：別有三釋，此為一因，證唯無記。《攝論》第三卷未自解，善趣既是善，應不生不善，恒生善故即無流轉。由集故生死流，由苦故生死轉，惡趣翻亦然。既恒生惡應無還滅，由道故還，由滅故滅。

The Commentary states: Specifically, there are three explanations; this is the first reason, proving that it is exclusively indeterminate. Near the end of the third fascicle of the Mahāyānasaṃgraha, it is personally explained: if the good destinies were wholesome, they would not produce the unwholesome; constantly producing the wholesome, there would be no transmigration. Through the origin, saṃsāra flows; through suffering, saṃsāra turns. For evil destinies, the reverse is also true: constantly producing the unwholesome, there would be no cessation. Through the path, there is return; through cessation, there is extinguishing.