The Explanation of Sandhyā and Related Daily Observances
Saṅdhyā-ādi Nitya-karma-Vidhi
पृष्ठवंशे वमित्युक्तं नाभौ भं हृदये तु मम् । यादिसप्तापि धातुस्था हं प्राणे लं तथात्मनि ॥ १०५ ॥
pṛṣṭhavaṃśe vamityuktaṃ nābhau bhaṃ hṛdaye tu mam | yādisaptāpi dhātusthā haṃ prāṇe laṃ tathātmani || 105 ||
Diz-se que «vaṃ» deve ser colocado na coluna vertebral; «bhaṃ» no umbigo; e «maṃ» no coração. Do mesmo modo, as sete letras que começam com «ya» permanecem nos dhātu (constituintes do corpo); «haṃ» está no prāṇa (sopro vital), e «laṃ» no ātman (o Ser).
Sanatkumara (teaching Narada in a Vedanga/technical context of mantra-nyasa)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
It presents a nyāsa-style inner mapping of mantra-syllables onto the body—spine, navel, heart, dhātus, prāṇa, and ātman—showing how recitation is internalized as a yogic-sacred physiology aimed at purification and realization.
By prescribing internal placement of sacred sounds, it turns mantra-japa into an embodied act of remembrance; such inward worship supports steady devotion by linking breath, heart, and self to continuous mantra-awareness.
It reflects Śikṣā (phonetics/mantra-sound discipline) and allied mantra-vidyā: precise syllable identification (e.g., ya-varga group) and their ritual-yogic application through nyāsa with prāṇa and bodily dhātus.