The Talmud states: “When a person becomes angry, he acquires only his anger.”

There are usually no benefits in becoming angry at others. Becoming angry merely causes harm to your health and makes you feel miserable. Your anger does not help you, and the person you are angry with usually pays less attention to what you are saying than if you’d have said it tactfully and patiently.

Sources: Kiddushin 41a; Toras Avraham, p.440; Rabbi Zelig Pliskin’s “Gateway to Happiness,” p.189