Narada Purana — Purva Bhaga, Shloka 60
Dīkṣā, Mantra-Types, Mantra-Doṣas, and Qualifications of Ācārya–Śiṣya
सिद्धिर्न जायते तेषां कल्पकोटिशतैरपि । छिन्नादिदोषदुष्टानां मंत्राणां साधनं ब्रुवे ॥ ६० ॥
siddhirna jāyate teṣāṃ kalpakoṭiśatairapi | chinnādidoṣaduṣṭānāṃ maṃtrāṇāṃ sādhanaṃ bruve || 60 ||
断絶などの過失によって穢されたそのような真言には、幾百の倶胝劫を経ても成就は生じない。いま、かかる真言を成就させる（正し、成功裡に用いる）ための正しい修法を説こう。
Sanatkumara (teaching Narada)
Vrata: none
Primary Rasa: vira
Secondary Rasa: shanta
FAQs
It teaches that mantra-siddhi depends on purity and correctness; a mantra corrupted by defects cannot yield fruit, so disciplined rectification and proper sadhana are essential.
It implies that devotion must be expressed through right practice—careful recitation and faithful observance—so that the devotee’s worship becomes effective rather than merely emotional or careless.
It highlights Vedanga disciplines like Śikṣā (phonetics) and Vyākaraṇa (grammar), stressing that correct sound, form, and transmission of mantras are prerequisites for ritual efficacy.