Adhyāya 2, Āhnika 1, Sūtra 1

ata ūrdhvaṃ pramāṇādiparīkṣā/ sā ca vimṛśya pakṣapratipakṣābhyām arthāvadhāraṇaṃ nirṇayaḥ ity agre vimarṣa eva parīkṣyate —

samānasya dharmasyādhyavasāyāt saṃśayo na dharmamātrāt/ atha vā samānam anayor dharmam upalabha iti dharmadharmigrahaṇe saṃśayābhāva iti/