Nirukta, Phonetic Variants, and Vedic Dhātu–Svara Taxonomy
ब्रूह्याद्यादेः परस्याप्यौ श्रावयेत्यादिके प्लुतः । दाश्वांश्व स्वतवान्यापौत्रिभिष्ट्वं च नृभिष्टुतः ॥ १७ ॥
brūhyādyādeḥ parasyāpyau śrāvayetyādike plutaḥ | dāśvāṃśva svatavānyāpautribhiṣṭvaṃ ca nṛbhiṣṭutaḥ || 17 ||
「brūhi」に始まる形やそれに類する語法、また後続の語「au」、さらに「śrāvayet」に始まる形においては、母音はプルタ(引き延ばし音)として発声すべきである。同様に「dāśvāṃśva」「svatavān」および「yā‑pautri‑」の連なりでは「tvaṃ」の音を用い、「nṛbhiṣṭutaḥ」には相応の音声規定が定められる。
Sanatkumara (teaching Narada)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: none
It teaches that precision in sacred sound (śabda)—especially correct vowel length and prescribed forms—is part of dharma and supports the purity and efficacy of Vedic study that ultimately aids moksha-oriented discipline.
While technical, it supports bhakti indirectly: devotion expressed through mantra and recitation becomes steadier and more potent when pronunciation follows śikṣā and vyākaraṇa, preventing errors (doṣa) in worship and japa.
Śikṣā (phonetics) and Vyākaraṇa (grammar): specifically the use of pluta (protracted) vowels and prescribed word-forms in Vedic recitation contexts.