Memorize this:

Psalm 37:1-6

Do not fret because of evil men or be envious of those who do wrong; for like the grass they will soon wither, like green plants they will soon die away. Trust in the LORD and do good; dwell in the land and enjoy safe pasture. Delight yourself in the LORD and he will give you the desires of your heart. Commit your way to the LORD; trust in him and he will do this: He will make your righteousness shine like the dawn, the justice of your cause like the noonday sun.