Nyayasutra 5.1.1

5.1.1

sādharmyavaidharmyotkarṣāpakarṣavarṇyāvarṇyavikalpasādhyaprāpty aprāptipraṣaṅgapratidṛṛṣṭāntānutpattisaṃśayaprakaraṇahetvarthā pattyaviśeṣopapattyupalabdhyanupalabdhinityānityakaāryasamāḥ
{siddhānta-sūtra}