iyam apyarthāpattiḥ kadācit pratyakṣapūrvikaiva, yadā pratyakṣeṇa kāryam upalabhya kāraṇasya śaktiravagamyate /
This presumption [of potencies] too is sometimes based on perception alone, [namely] when the potency of a cause is understood after perceiving [its] effect.