Devotion Needs No Other Proof
Narada teaches that love is self-evident to the one who feels it, requiring no external evidence or logical demonstration.
Bhakti does not depend on proofs, for it is self-validating like the experience of taste, which no description can convey and no argument can refute (Narada Bhakti Sutra 59 theme). One who has loved knows love directly, and to such a one no skeptic's argument is troubling. This places devotion beyond the reach of intellectual doubt, which can endlessly question concepts but cannot deny a living experience. Narada thus frees the devotee from the anxiety of having to defend their faith philosophically. The glory of devotion is its immediacy and certainty, grounded in the heart rather than in shifting reasoning. The lover rests in a knowledge surer than any logic, for it is the knowledge of direct relationship.
It is to be known by experience alone, as the taste of sweetness is known.
The appeal to direct experience over discursive proof aligns with William James's argument in The Varieties of Religious Experience that the noetic certainty of mystical states is, for those who have them, beyond the reach of intellectual refutation.
Narada Bhakti Sutras