Kārttavīrya–Paraśurāma-saṅgrāma-kathā
Sagara’s Inquiry and Vasiṣṭha’s Account
मन्त्र साधयतो भद्रे न च तत्सिद्धिरेति हि / आत्रास्ति कारणं भक्तिः साव वै त्रिविधा मता
mantra sādhayato bhadre na ca tatsiddhireti hi / ātrāsti kāraṇaṃ bhaktiḥ sāva vai trividhā matā
O Bhadrā, even for one who practices mantra-sādhana, its siddhi does not necessarily arise. Here the cause is bhakti, which is held to be threefold.