Mahāviṣṇu-Mantras: Aṣṭākṣarī, Sudarśana-Astra, Nyāsa Systems, Āvaraṇa-Pūjā, and Prayogas
मंत्रार्णहृत्परायाद्यमात्मने हृदयांतिमम् । तत्तन्नाम समुच्चार्य्य न्यसेत्तत्तत्स्थले बुधः ॥ १९ ॥
maṃtrārṇahṛtparāyādyamātmane hṛdayāṃtimam | tattannāma samuccāryya nyasettattatsthale budhaḥ || 19 ||
मंत्रातील अक्षरांपासून आरंभ करून हृदयापर्यंत नेऊन, आणि आत्म्यासाठी हृदयप्रदेशाच्या शेवटी अंतिम (अक्षर) स्थापावे; तत्तत् नाम उच्चारून, बुध साधकाने तत्तत् स्थानी न्यास करावा.
Narada
Vrata: none
Primary Rasa: shanta
Secondary Rasa: bhakti
It teaches nyāsa as an inner sanctification: mantra-syllables are not merely recited but consciously installed in specific loci—culminating in the heart—so the practitioner internalizes the deity/mantra as direct inner presence.
By directing the practice to the heart-region, it frames devotion as inward worship (mānasa/upāṃśu orientation), where recitation and placement make the heart the seat of the beloved form invoked by the mantra.
A technical ritual procedure (mantra-vidhi) is emphasized: correct sequencing of syllables, precise utterance (uccāra), and prescribed placement (nyāsa)—a hallmark of applied Vedic auxiliary disciplines used in worship.