An enemy is not pleased with an enemy's going to heaven. This is the seventh thing pleasing to an enemy, bringing about an enemy's aim, that comes to a man or woman who is angry. A person overwhelmed with anger destroys his wealth. Maddened with anger, he destroys his status. Anger brings loss.
Anger inflames the mind.
He doesn't realize that his danger is born from within. An angry person doesn't know his own benefit. An angry person doesn't see the Dhamma. A man conquered by anger is in a mass of darkness. He takes pleasure in bad deeds as if they were good, but later, when his anger is gone, he suffers as if burned with fire.