There is a Greek word used often in the New Testament that literally means “to place or lay away from.” It was used of clothes in Acts 7:58, but mostly it is used figuratively. Romans 13:12 states, “Let us cast off the works of darkness.” The idea of the word is to “put away from oneself, never to take it up again.”
In Colossians 3:8, Paul lists a number of vices that are highly inconsistent with the moral standards of a faithful Christian, and he commands to “cast off” these behaviors “away from oneself.” Included in this list is “filthy language out of your mouth.” The word for “filthy language” involves “obscene speech, dirty talk.” James says that “blessing and cursing…ought not” to proceed “out of the same mouth” (3:10), and here Paul is ordering Christians to get “out of your mouth” the words and nuances that are foul, vile and obscene in the eyes of God.
May God help us to “cast off,” out of our mouths, the language that does not become a child of the holy God!