Sarvadarshanasangraha 13.20

13.20

iti/ tasmād vyākaraṇaśāstrasya śabdānuśāsanaṃ bhavati sākṣāt prayojanam/ pāraṃparyeṇa tu vedarakṣādīni/ ata evoktaṃ bhagavatā bhāṣyakāreṇa: rakṣohāgamalaghvasaṃdehāḥ prayojanam iti/

Hence we conclude that the exposition of words is the direct end of the rules of grammar, but its indirect end is the preservation, &c., of the Veda. Hence it has been said by the worshipful author of the great Commentary [quoting a Vārttika], "the end (or motive) is preservation, inference, scripture, facility, and assurance."[13] Moreover prosperity arises from the employment of a correct word; thus Kātyāyana has said, "There is prosperity in the employment of a word according to the śāstra; it is equal to the words of the Veda itself." Others also have said that "a single word thoroughly understood and rightly used becomes in Svarga the desire-milking cow." Thus (they say)—