God requires you to change your ways when you become a Christian. Before you were a true believer you walked in the ways of the world, you did things that earn God’s wrath:
Because of these, the wrath of God is coming. 7 You used to walk in these ways, in the life you once lived. (Colossians 3:6-7 NIV).
Now that you are a true believer you need to “rid yourselves” of these things. Here is a specific list of things that you must exterminate from your life:
8 But now you must also rid yourselves of all such things as these: anger, rage, malice, slander, and filthy language from your lips (Colossians 3:8).
Anger. It is wrong to hate another individual, at least for now before God’s final judgment. When you hate others you become a hypocrite, since you yourself have done horrible things. It is OK to hate a person’s sinful deeds, but be careful lest you take this too far and start hating the individual as well. You must love all people, including those who make themselves your enemies (Matthew 5:44 NIV). There is no place in Christianity for hatred against another person.
Rage. Rage is a violent, passionate expression of your anger. Rarely ever, is such a thing acceptable in a Christian. If you ever need to rebuke another brother for his sin, you need to do it in love with gentleness (Galatians 6:1). Do not rage against another person, whether believer or unbeliever, no matter what they have done. Let your actions and body language reflect love, even when you are telling another brother of his sins.
Malice is a deep desire for others to be hurt. Christians should always want and pray for what is best for others. If you need to rebuke someone or tell on them, you should never do it from malice. That is to say, you should not do it for the purpose of hurting them. Rather you should do it for the purpose of helping them heal.
Slander is saying something negative about someone else that is not true. We need to be very conservative when we say negative things about others. We should never lie about others no matter what they have done to us, and there are some secrets that we should not reveal about our enemies even if they are true. Words can do a lot of damage, so we must be careful not to be involved in using damaging words.
Filthy language can be saying anything unwholesome. Often it includes a lot of sexual innuendo. Christians should never to use sexual references to degrade others. This is not only damaging and hurtful to those you are joking about, but it is also degrading to sex itself. Christians need to speak about sex carefully and respectfully. Sex is sacred. It is one of God’s great gifts to mankind.