" We often think that an “anger problem” must mean some major personal or interpersonal trouble. We think that the main sins to be solved are the violence, the tantrums, the arguing, the rancor, the deep-seated bitterness, the sour attitude. It’s true, these are serious business. If they remain unsolved, human life becomes a living hell. But in my experience, I’ve found that it’s often best to start with little problems. Disentangle your complaining. Come out to the clear, firm alternative. How on earth does a sour, negative attitude become a sweet, constructive spirit? Learn that and you’ve learned how to live well. You learn the secret of contentment (Philippians 4: 11–12). "

― David A. Powlison , Good and Angry: Redeeming Anger, Irritation, Complaining, and Bitterness