The song, Amazing Grace, expresses a deep awe of God for how He changes the worst of sinners. The songwriter, John Newton, was not only immoral, but also a part of the horrible slave trade. He later became integral in the ending of the transatlantic slave trade with William Wilberforce, who also had a life transformed by Jesus. What can God do through you with His Amazing Grace?
Video referenced is Dan Vasc singing Amazing Grace at https://www.youtube.com/watch?v=89g9yMGFGlM.
