Set your minds on things above, not on earthly things.
Finally, brothers and sisters, 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.
Jesus defeated Satan at the cross and took away his tools of evil so he tries to attack your mind by putting evil thoughts in your mind. You need to bind the Spirit of Heaviness and all evil spirits out of your mind. Put on the full Armor of God and pray a hedge of protection around yourself.