So if we're people who hunger for righteousness, our lives will be characterised by truthfulness. We'll be people whose word can be trusted. We won't need to swear by heaven, or in God's name for people to believe us. Then there's loyalty to our brothers and sisters. Come to terms quickly with your accuser while you are on the way to court with him, or your accuser may hand you over to the judge, and the judge to the guard, and you will be thrown into prison.
Anger is OK if it's righteous anger, anger against some injustice or sin in the world.
But anger that's personal, that's directed at a person, with the implication that the world would be better off if that person weren't in it, is tantamount to murder. The test is whether the anger is rooted in a just cause or simply a reaction caused by my personal feelings, my pride or self-interest. And when something has come between me and a brother or sister, being part of God's family demands that I do all in my power to resolve the issue at hand. If I've offended them I need to go and make amends. For whatever reason our relationship has broken down, the onus is on me to do something about it.