supariniścitaṃ liṅgaṃ gamakam iṣyate na saṃdigdham, nahi dhūmo bāṣpādirūpeṇasandihyamāno vahner niścāyako bhavati /
A well-ascertained reason is considered indicative, not a doubtful one; for smoke, when doubtful due to [possible confusion with] vapor etc., does not lead to certainty about fire.