Finally, brothers, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable — if anything is excellent or praiseworthy — think about such things. Philippians 4:8
This is a great verse to keep in mind. Literally.
Try to fill your head with things that are true, noble, right, pure, lovely, admirable, excellent or praiseworthy. If a thought doesn’t fit one of those categories, don’t think it.
Want a good place to start? Think about Jesus.