No one is perfect in anger, so we must be willing to forgive things that are said during times of wrath or purposefully hurtful things said in anger. But we also must count the cost before we speak such things if we desire to be pleasing to God. We should never curse people, put them down, or try to hurt them with our words in anger. This is sin and should not be happening with believers. Our suppressed anger needs an outlet and we should talk to someone about it before it causes us to lose those that love us. Wrath from our past can be uncontrollable at times, so if we plan to get control, we must pray and ask God for temperance. This comes by forgiving those that hurt you, listening to those that love you, and trusting those that depend on you. If we ever plan to be used by God, we must get to a place where God can trust us.
Prov. 15:1 A soft answer turneth away wrath; But a grievous word stirreth up anger.-G. Craige Lewis