My wife and I went to their concert last week and their lead singer, Mark Hall, talked about the origin of the song. It was based off the poem "Christmas Bells", by Henry Wadsworth Longfellow. Longfellow wrote the poem on Christmas Day in 1864 during the Cival War. He had just found out that his son had been injured in the war and he had also recently lost his wife. Needless to say, there was not much peace in his life. With that said, he had peace with Jesus. Enjoy the song for Casting Crowns...