When we think of anger, we usually look inward. Anger is my emotion. Anger is my responsibility. I must control my emotions. While this is all true, it's only half the truth.
Anger is also relational.
Anger takes two or more to happen and to be resolved. For instance, a recent study of military families indicates that the lengthy absence of fathers who are away on active duty has a major impact on the children. Many of these children suffer from poor impulse control and anger that verges on rage. These kids are more likely to be bullying kids. God has a relational perspective on anger.