To start with, it's good to acknowledge that anger is a natural response to when we see wrong - even Jesus made His thoughts known when people disrespected God's house (Matthew 21:12). It's when we hold onto that anger that it becomes a problem. We've all been there. Got into an argument one day and replayed the situation over and over again in our minds, imagined ourselves vindicated. If we don't try to respond constructively - and calmly - we leave the door wide open for all the anger to spill out. And that's when the enemy can niggle his way in, and make us start acting on a completely different path to what God wants for us. Anger makes more anger. Let anger have enough breathing room, and you start breathing fire: people start seeing you as the dragon in the den (probably without the stash of golden cash?).
Here's what Jesus teaches about letting go of anger: 'So when you offer your gift to God...and you remember that your brother or sister has something against you, leave your gift... Go and make peace with that person...' (Matthew 5:23-24 NCV). It brings much more freedom to channel your anger into making things right. As hard as it might be, giving full vent to your anger will only let it grow. Approach life in a way where you're willing to not let your feelings get the better of a situation.
So what now? Look to resolve. Do you have a thought festering in your mind? It's time to pray for a way to approach whoever's involved. Or, if that's difficult, talk to someone you can trust. Don't let it stay inside.
Soulfood : Gen 25:19 - 27:46, John 13:31-38, Ps 65, Prov 31:25-27