The nocturnal birds, lust, anger, greed, attachment, conceit and hatred. infest the tree of life and foul the heart where they build their nests. When we sing aloud the Glory of God, the heart is illumined and they cannot bear the light. Besides, the voice that rises from many throats frightens them and they fly away.

Bhagawan Sri Sathya Sai Baba
Divine Discourse, April 1, 1975