His wrath kindled and burned hot against sin, as sin was laid on Jesus on the cross. Jesus was consumed like a dry branch and died on the cross for sin, all sin, your sins and mine. The anger of God is past. It was spent on Jesus. There is now peace between God and those who trust in the sacrifice of Christ.
Fire can be both good news and bad news.
Brush fires, house fires, and forest fires are destructive and therefore are bad news and are feared. Campfires, home fires, and oven fires are good news as they warm the hands, heart and food. Through the prophet Jeremiah, the Lord calls His Word a fire, and Jesus says that He has a fire to cast upon the earth. For us in Christ the destructive consuming fire of God's anger is past. Now fire is for us a symbol of comfort as we warm our souls by the comforting flames of the Holy Spirit as He helps us experience God's true and lasting peace in our lives through Word and Sacrament.