Refrain from anger and abandon wrath; do not fret—it can only bring harm.Psalm 37:8 BSB
Why does the Lord want us to refrain from anger (unrighteous anger)?
for man’s anger does not bring about the righteousness that God desires.James 1:20 BSB
Anger doesn’t glorify the Lord as it feeds the flesh. “Do not fret” means not to allow yourself to fall into a rage. Rage blinds the mind, making the person get out of control. Not only can you harm yourself but others as well. Look at what happened with Cain and Abel. Cain’s anger took his brother’s life away because of jealousy see below.
4 while Abel brought the best portions of the firstborn of his flock. And the LORD looked with favor on Abel and his offering, 5 but He had no regard for Cain and his offering. So Cain became very angry, and his countenance fell…8 Then Cain said to his brother Abel, “Let us go out to the field.” And while they were in the field, Cain rose up against his brother Abel and killed him.Genesis 4:4-5, 8 BSB
Emotions like anger can cause a catastrophic event in your life. Before that happens, get on your knees and cry out to the Lord for peace of mind (Philippians 4:6-7). The God whom I serve—the Lord Jesus Christ—will give you His peace and calmness of heart so that your soul—resting in His hands may find the love of God.