俱舍論疏 6.180

6.180

論「若爾至此為果故」，此難無為合有因也。凡立果名對於因稱，無為是果，應合有因。

On the Śāstra's: "If so [...] because this is a result": this raises the objection that the unconditioned should have a cause. In general, establishing the name "result" is stated in opposition to "cause"; if the unconditioned is a result, it should have a cause.