Śaṅkaraon Brahma Sūtra 3.3.48

And that there are to be observed indicatory marks leading to the same conclusion, has already been declared in Siitra 44.— But, under Sutra 45, it was shown that indicatory marks unaided by other reasons cannot be admitted as proving anything, and it was consequently determined that, owing to the influence of the leading — subject-matter, the Agnis form part of the sacrificial action ! To this objection the next Sutra replies.