俱舍論記 5.152

5.152

「此生等相至生等相故」者，此下明隨相問起。本相有為，應有生等。若更有相，便成無窮。

On "Do these characteristics of arising and the rest... because of having characteristics of arising and the rest?": from here down, this raises questions to clarify the secondary characteristics. If the primary characteristics are conditioned, they should have arising and the rest. If there were further characteristics, it would lead to infinite regress.