One unchecked emotion is enough to abort what God is doing in your life. The negative emotion that you fail to conquer will incubate until you wake up one day and realize that your whole life is consumed by it. God has a better plan for you.
Philippians 4.8: Finally, brethren, whatever things are true, whatever things are noble, whatever things are just, whatever things are pure, whatever things are lovely, whatever things are of good report, if there is any virtue and if there is anything praiseworthy — meditate on these things.