cakṣuṣi dharmiṇi cakṣurvijñānotpādanaśaktiḥ sādhyate tadāpi śaktiḥ sattetyādeḥ paryāyatvāt tatsādhane sattāsādhanaprasaṅgaḥ
If what is sought to be proved is the potency in the eye [as] the subject to bring about visual perception, even then, since 'potency', 'existence', etc. are synonymous terms, the proving of [this] potency would involve the proving of existence.