Bhakti Vikasa Swami: Prahlada Maharaja's description of pure bhakti [ 2009-05-06 ]
One who is situated in devotional service is certainly the controller of his senses, and thus he is a liberated person. When such a liberated person, the pure devotee, hears of the transcendental qualities and activities of the Lord's incarnations for the performance of various pastimes, his hair stands on end on his body, tears fall from his eyes, and in his spiritual realization his voice falters. Sometimes he very openly dances, sometimes he sings loudly, and sometimes he cries. Thus he expresses his transcendental jubilation.

When a devotee becomes like a person haunted by a ghost, he laughs and very loudly chants about the qualities of the Lord. Sometimes he sits to perform meditation, and he offers respects to every living entity, considering him a devotee of the Lord. Constantly breathing very heavily, he becomes careless of social etiquette and loudly chants like a madman, "Hare Krsna, Hare Krsna! O my Lord, O master of the universe!"

The devotee is then freed from all material contamination because he constantly thinks of the Lord's pastimes and because his mind and body have been converted to spiritual qualities. Because of his intense devotional service, his ignorance, material consciousness and all kinds of material desires are completely burnt to ashes. This is the stage at which one can achieve the shelter of the Lord's lotus feet.

SB 7.7.34-36, texts