Nyayasutra 4.2

4.2

chalādibhiḥ sādhanamupālambho vā yatra sa tathoktaḥ | chalādibhistu pravartanaṃ saduttarāparisphūtau koṭibhaṅgabhiyā śākhāntarasaṅkramaṇāya | bāhyairavikṣiptaistattvadharmairjhaṭiti saduttarāparisphuraṇe tattvasaṃrakṣaṇāya ca boddhavyam | evaṃ ca vādavyavacchede'pi na kevalaṃ chalādibhirevātra vyavahriyate kintu pramāṇatarkābhyāmapīti jñāpanārthaṃ yathoktopapanna iti | yathoktenopapannena yogyena upapanno arthito yathoktopapanna iti madhyamapadalopī samāsau-mṛgākṣīpadavat | tathā ca vādalakṣaṇo-
nāmuktagrāhyāṇāmalābhe tṛtīyakakṣāsthito vādī prativādinaḥ sthāpanāṃ hetvābhāsena dūṣayati | evaṃ kakṣāntare'pi pūrvapūrveṣāṃ dūṣaṇānāmanāvatāre uttarottareṣāmudbhāvanamanyathānavasaragrahānnigrahānuyojyānuyogaḥ syāt | hetvābhāsānāṃ tu pratijñāhānyādibhiḥ sahoktagrāhyatvenāviśeṣe'pyarthadoṣatve praṇidhānagamyatayā caramamanusandhānamiti draṣṭavyam |