Narada Purana — Purva Bhaga, Shloka 2
Bhakti-Śraddhā-Ācāra-Māhātmya and the Commencement of the Mārkaṇḍeya Narrative
भक्तिर्भक्त्यैव कर्त्तव्यातथा कर्माणि भक्तितः । कर्मश्चद्धाविहीनानि न सिध्यन्तिं द्विजोत्तमाः ॥ २ ॥
bhaktirbhaktyaiva karttavyātathā karmāṇi bhaktitaḥ | karmaścaddhāvihīnāni na sidhyantiṃ dvijottamāḥ || 2 ||
バクティ（bhakti）はバクティによってこそ行われるべきであり、同様に諸々の儀礼行為（カルマ）もバクティから為されるべきである。シュラッダーを欠く行いは成就しない、ああドヴィジョーत्तマ（再生の最勝者）よ。
Sanatkumara (teaching Narada; addressing assembled dvijas in the didactic frame)
Vrata: none
Primary Rasa: bhakti (devotion)
Secondary Rasa: shanta (peace)
FAQs
It establishes bhakti (devotion) and śraddhā (faith) as the inner power that makes all religious practice fruitful; without them, karma becomes mechanically performed and fails to yield its intended spiritual result.
It teaches that bhakti is self-sustaining—devotion grows by practicing devotion—and that even Vedic duties (karmāṇi) should be rooted in devotion rather than mere formality.
The verse highlights the principle of correct ritual intention (śraddhā) underlying Vaidika karma; it is not a technical Vedāṅga rule (like Vyākaraṇa or Jyotiṣa), but a foundational requirement for successful ritual efficacy.