“You have heard that it was said to those of old, ‘You shall not murder; and whoever murders will be liable to judgment.’ But I say to you that everyone who is angry with his brother will be liable to judgment; whoever insults his brother will be liable to the council; and whoever says, ‘You fool!’ will be liable to the hell of fire.”
Matthew 5:21-22
Do not call someone a fool or an idiot or be unrighteously angry with anyone. According to Yeshua, the damage caused by emotional outbursts is equivalent to taking the life of an individual. Anger breeds an environment of death.
Anger is also a demonstration of unfiltered, and typically unjustified, opinion because the words we speak always come from the overflow of the heart.
The good person out of the good treasure of his heart produces good, and the evil person out of his evil treasure produces evil, for out of the abundance of the heart his mouth speaks.
Luke 6:45
Additionally, when we lash out at others, we reveal the weakness of our own character. Raw emotion can cause division because it is typically not based on the truth, but only on a perception of what one believes to be true. The reality of a situation may be significantly different.
If anger fosters death, then forgiveness fosters life. What anger kills, forgiveness resuscitates. Angry words designed to hurt are rendered powerless through the life generated by forgiveness.
Then Peter came up and said to him, “Lord, how often will my brother sin against me, and I forgive him? As many as seven times?” Jesus said to him, “I do not say to you seven times, but seventy-seven times.
Matthew 18:21-22
This demonstrates that the stores of forgiveness available to us are bountiful enough to outlast and overcome any personal infraction. Life can always overcome death. Choose life.
The Core of the Bible 