Thoughts. They can effect your mood, your attitude, even your life. If you think positively, positivity will be brought into your life. If you think negatively, negativity will be brought into your life. Why drain yourself in thinking about parts of your life that you have no control over, that passed. Why stay angry at something or someone that you long ago needed to forgive. Thinking too much about these things will do no good to your soul.
And now, dear brothers and sisters, one final thing. Fix your thoughts on what is true, and honorable, and right, and pure, and lovely, and admirable. Think about things that are excellent and worthy of praise. Philippians 4:8
God wants us to live a life with a pure and clean mind. A mind free from anger and hate. These unglodly thoughts will weaken you and drain you spiritually. You don’t want to experience spiritual sickness. Don’t let the enemy get to your head. Remember, if you have God, He will protect you from the inside while the enemy is trying to get to your head from the outside. Read the Word, pray, do good things for the Lord, and He will surely purify and strengthen out your mind. A godly mindset will bring godliness into your life.