因明入正理論疏 1.5

1.5

第一、敘所因者，因明論者，源唯佛說，文廣義散，備在眾經，故《地持》云：「菩薩求法，當於何求？當於一切五明處求。」求因明者，為破邪論，安立正道。劫初，足目創標真似。爰暨世親，咸陳軌、式。雖綱紀已列，而幽致未分，故使賓主對揚，猶疑立破之則。

First, as for relating the background causes: regarding the treatises on hetuvidyā, their source originated solely from the Buddha's preaching, but the text was vast and the meanings scattered, being present across the various sūtras. Thus the Bhūmidhāra says: 'When a bodhisattva seeks the Dharma, where should he seek it? He should seek it in all five sciences.' One seeks hetuvidyā in order to refute heterodox treatises and establish the orthodox path. At the beginning of the kalpa, Akṣapāda first established the genuine and the semblance. Down to Vasubandhu, all laid out the rules and formulas. Although the guidelines were set forth, the profound subtleties had not yet been analyzed; therefore, when opponents and proponents debated, they still doubted the rules of proof and refutation.