The nature of devotion is indescribable, indefinable.
Like the taste enjoyed by the dumb.
In some rare ones who are fit recipients, this (such pure love or devotion) is found to manifest.
This pure love is without attributes, without poison of desires, every moment increasing, unbroken, subtlest, of the nature of sheer immediate experience…
Having reached the Supreme Love, the devotee sees, feels, comprehends that alone, hears that alone, speaks of that alone and thinks and contemplates upon that alone.
Narada Bhakti Sutra (51 to 55)