When I first became a Christian, I had a bad mouth. I am thankful that over time God worked to change my heart, and as a result, my mouth. I knew right away that talking in a particular way was offensive to God and others. It does not have a place among those professing faith in Christ because it does not give grace to those who hear (Eph. 4:29). This is pretty straightforward. But I’ve noticed that many Christians are still plagued by a foul mouth. They say ‘Christian swear words’ that are offensive to God and to others.