因明入正理論疏 1.19

1.19

四問：「立、破有言智，可是因明。現、比無智言，應非因明。」答：「見因亦明，見因證明，自證亦因，故皆因明。」

Fourth question: "Proof and refutation possess verbal cognition, so they may be hetuvidyā. Direct perception (pratyakṣa) and inference (anumāna) have no verbal cognition, so they should not be hetuvidyā." Answer: "Observing a reason is also an illumination; observing a reason verifies an illumination; self-verification is also a reason; therefore, all are hetuvidyā."