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 ||
Tous les mantras deviennent pleinement opérants lorsque le prāṇa est établi dans les deux nāḍīs. Mais la récitation d’un mantra au temps du sommeil donne un fruit nuisible ou vain.
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.