sā ca śaktir anabhyāsād aviditakāryair avadhārayituṃ na śakyata ityuttarakāryajñānapravṛttyā niścīyata iti prathamasya parataḥprāmāṇyam ucyate /
And that capacity cannot be ascertained by those who do not know the effects due to lack of practice - thus it is ascertained through the occurrence of the cognition of subsequent effects - therefore the validity of the first [cognition] is said to be dependent on something else.