At a certain pitch of religious experience, the heart just wants to sing; it breaks into song. Paradoxically, you could say when silence finds its fullness, it comes to word. As the Book of Wisdom says, "When night in its swift course had reached its halfway point and deep silence embraced everything" -- when night was at its darkest and deepest -- there "the eternal Word leaped from the Heavenly throne": silence burst into song.
A legend told by the Venerable Bede says that the poet Caedmon was once completely mute. It was a custom in his village to spend evenings taking turns reciting poetry. On these occasions, Caedmon, unable to speak, would steal away to nearby hills to escape. One evening while walking alone, an angel appeared and urged him to sing. Miraculously, he began to sing and went on the become a famous poet.