Nyayasutra 12.25

12.25

upapadyate'nena sādhyamityupapattiḥ pramāṇam | tena samā upapatti sameti samākhyālabhyameva lakṣaṇamanūdyate | kāraṇapadenātra jñaptikāraṇaṃ yogyatāmahimnocyate | tathā cobhayasya pakṣapratipakṣabodhakasya kāraṇopapatteḥ kāraṇasadbhāvāt pratyavasthānamupapattisametyarthaḥ | parapakṣe sādhanasādhāraṇadharmabalena svapakṣasādhanopapādanāddoṣāmidhānamupapattisameti phalitam |
yatra parapakṣasādhanasādhāraṇena sattvādinā svapakṣasyāpi sādhanaṃ sādhayati tatropapattisamā bhavati | yathā śabdo'nityaḥ kṛtakatvādityakte yathā tvatpakṣe'nityatvasādhanaṃ tathā matpakṣepi nityatvasādhanaṃ bhaviṣyati, sattvādeḥ tvatpakṣavaditi nitya eva syānnānitya iti | anayā paramparayā bādhapratirodhau derśyete iti tadābhāsā jñeyam | prakaraṇasamasaṃśayasamayostu vyavasthitane hetunā sākṣāt svapakṣe sādhyameva sādhyate | atra tu sākṣāt sādhanaṃ sādhyate paramparayārthāt sādhyaṃ siddhayatīti tābhyāṃ bhedaḥ |
atrottaram-