Nyayasutra 12.21

12.21

arthāpattivadanupapattirarthāpattyābhāsastena samārthāpattisamā | arthāpattitayābhimanyamānatvāt | pratipakṣasya pratipipādayiṣitavirodhinaḥ siddheḥ pratyavasthānamarthāpattisama ityarthaḥ | uktasyānuktākṣepakatavaniyama ityabhimānena doṣābhidhānamarthā pattisamā | yathā śabdo'nitya ityukte'rthādāpadyate nānyadanityam | viśeṣavidheḥ śeṣaniṣedhaphalakatvāt | tathā ca sādhyavikalo dṛṣṭāntaḥ | viruddhatā ca hetoḥ kṛtakatvādanitya ityukte'rthādāpadyate anyasmānnitya iti | bādhaḥ satpratipakṣo vā | evaṃ pratyakṣādanitya ityukte'rthādāpadyate'numānānnitya iti bādha eva | kiñca kṛtakatvādanityaityukte hetvantaraṃ savyabhicāraṃ na veti draṣṭavyam | antye anyasya tadbhāva idameva tathā prāptam | ādye tulyayogakṣematvāt, idamapi tathā kathaṃ na syāt | evameva hetvantaraṃ viruddhatvādinā vikalpyānyathātvamāpāda nīyamiti | sarvadoṣadeśanābhāsā ceyam |