Dealing with anger in a responsible way

And 'don't sin by letting anger control you.' Don't let the sun go down while you are still angry. (Ephesians 4:26, NLT)

Although this is a biblical command, anger is treated as taboo in many Christian circles. Repression of this normal human emotion is neither righteous nor healthy; in fact, it can lead to serious problems. If you fail to recognize your anger, you are likely to let the sun go down on it and take it to bed. This gives the devil an opportunity a place of entrance into your life.

It can also result in various health problems. Therefore, early recognition of this powerful feeling is vital. The command Be angry gives you permission to have such feelings, so you are free to face them openly. You do, however, need to be careful how you express them.

Anger can be a signal that something is wrong and needs to be addressed. Sometimes, though, your wrathful feelings are based on distortions: misunderstandings or misinterpretations.

Recognizing such distortions can be very freeing. If you have not acted on these feelings in hurtful ways, you can simply release them. However, if you have dealt with your anger in sinful ways, you will need to ask forgiveness to God and anyone else you have hurt. Dealing with anger in a responsible way frees you to live abundantly. - Jesus [1]

I was angry with my friend; 
I told my wrath, my wrath did end.
I was angry with my foe: 
I told it not, my wrath did grow. - Willliam Blake

[1] Anchor You Can Control Your Anger