Narada Purana — Purva Bhaga, Shloka 44
Dīkṣā, Mantra-Types, Mantra-Doṣas, and Qualifications of Ācārya–Śiṣya
स मनुः सिद्धिहीनः स्यान्मंदः पंक्त्यक्षरो मनुः । कूट एकाक्षरो मंत्रः स एवोक्तो निरंशकः ॥ ४४ ॥
sa manuḥ siddhihīnaḥ syānmaṃdaḥ paṃktyakṣaro manuḥ | kūṭa ekākṣaro maṃtraḥ sa evokto niraṃśakaḥ || 44 ||
若一“咒”（manu）无成就（siddhi），则被视为羸弱；由一列音节相续而成者，称为“manu”。而“kūṭa”乃一音之咒；唯此被称为“无分”（niraṃśaka）。
Sanatkumara (teaching Narada in a technical Vedanga/mantra-śāstra context)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: none
FAQs
It distinguishes mantras by functional potency: a mantra lacking siddhi is ‘weak,’ while the most condensed one-syllable form (kūṭa) is described as ‘partless,’ implying concentrated power when properly received and applied.
Indirectly, it supports bhakti practice by emphasizing that devotional recitation should be grounded in an efficacious mantra—especially a concentrated seed-form—received through proper tradition, rather than mere mechanical repetition.
Mantra-śāstra/Śikṣā-oriented technical knowledge: the verse classifies mantras by syllabic structure (paṅkti-akṣara vs ekākṣara) and links structure to siddhi (practical efficacy in japa and ritual).