The song "Angel of Mercy" by Jonny Lang is an expression of gratitude to someone who has been a savior and a source of hope in times of need. The singer refers to this person as his "angel of mercy" and praises her for all the ways she has come to his rescue. He believes that this person has been sent from heaven to watch over him. The lyrics express the singer's deep faith and trust in this person, who is able to lift him up and help him overcome his troubles. He speaks of feeling a fever coming over him, and just a touch of his angel's hand is enough to heal him and make him whole again. The singer also expresses his desire to stay close to this person and be led by her to a place of paradise. He uses the image of an angel coming down from the sky to capture the sense of transcendence and divine intervention that he associates with his angel of mercy. Overall, the song is a testament to the power of faith and the hope that comes from knowing that someone has your back. The singer is grateful for this person's presence in his life and believes that she is a gift from God.