yataḥ śaktir anyā na vastutaḥ sakāśāt, sa ca śaktaḥ padārthaḥ pratyakṣa evetigṛhītagrahaṇād eva na pramāṇam
Since potency is not different from the actual thing, and that potent object is perceptible directly, [presumption] would be grasping what is already grasped and thus cannot be a valid means of knowledge.