Proverbs 15:18 A wrathful man stirreth up strife: But he that is slow to anger appeaseth strife.
The man full of anger and wrath stirs up trouble. The man who can control his anger will calm things down. I want to be careful not to be a man with a short fuse. I want to be calm trusting God to work in the situation. I want to be a peacemaker. So I will work at bringing my heart and emotions under control.
As a missionary dealing with your people this verse will be very important. You might feel like you have the right to be angry but if you get angry you will only cause more problems. Take your time. Be calm. Make peace and God will be able to work in the situation.