Anger can be a righteous blessing. Mark 3:1-5; Psalm 119:53. Anger can be righteous indignation in the face of that which is wrong, a quality without which no good character can flourish and no soul can stand against sin (Barclay).
Anger can be a sinful curse. Colossians 3:8A; James 1:19-20. Which it will be is entirely up to us. We therefore need to learn to be angry only when Jesus would be angry and to express anger only the way Jesus would express it, or as Paul put it in Ephesians 4:26, we must learn how to “be angry, and yet do not sin.”
What is anger? Anger is a God given emotion we should feel when something truly valuable is threatened with harm, is being hurt, or has been damaged so we will protect it from impairment or further injury.
For further reading, click on the sermon lesson sheet