Narada Purana — Purva Bhaga, Shloka 9
Dīkṣā, Mantra-Types, Mantra-Doṣas, and Qualifications of Ācārya–Śiṣya
सर्वे मंत्राः प्रबुध्यंते वायौ नाडिद्वयाश्रिते । स्वापकाले तु मन्त्रस्य जपोऽनर्थफलप्रदः ॥ ९ ॥
sarve maṃtrāḥ prabudhyaṃte vāyau nāḍidvayāśrite | svāpakāle tu mantrasya japo'narthaphalapradaḥ || 9 ||
பிராணவாயு இரு நாடிகளிலும் நிலைபெற்றால் எல்லா மந்திரங்களும் முழுமையாக விழித்தெழும். ஆனால் உறக்க நேரத்தில் செய்யும் மந்திர ஜபம் அர்த்தமற்ற அல்லது தீங்கான பலனைத் தரும்.
Sanatkumara (teaching Narada in the Vedanga/technical discipline context)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: bhayanaka
FAQs
It links mantra-siddhi to disciplined prāṇa: when the life-breath is properly aligned in the nāḍīs, mantra becomes “awake” (effective); careless japa done in sleep-state is warned against as producing inauspicious or futile outcomes.
It implies that devotion expressed through japa must be conscious and attentive; sincere bhakti is strengthened when the devotee’s awareness and breath-discipline support the mantra, rather than letting practice lapse into unconscious repetition.
A technical rule of mantra-prayoga is taught: proper timing and the role of prāṇa/nāḍīs (a yoga-technical adjunct often paired with śikṣā and ritual procedure) determine the efficacy of japa, and sleep-time recitation is discouraged.