He who loves me is made pure; his heart melts in joy. He rises to transcendental consciousness by the rousing of his higher emotional nature. Tears of joy flow from his eyes, his hair stands on end, his heart melts in love. The bliss in that state is so intense that, forgetful of himself and his surroundings, he sometimes weeps profusely, or laughs, or sings, or dances; such a devotee is a purifying influence upon the whole universe.
-Srimad Bhagavad Gita "Srimad Bhagavatam 11.8"