BHAKTI in itself is as wide as the heart-yearning of the soul for the Divine and as simple and straightforward as love and desire going straight towards their object. It cannot therefore be fixed down to any systematic method
Aurobindo establishes Bhakti’s foundational character as an irreducible heart-impulse that transcends systematic yogic methodology, distinguishing it categorically from Rajayoga, Hathayoga, and Jnanayoga.
, The Synthesis of Yoga, 1948thesis