Colossians 3:15 And let the peace of God rule in your hearts, to that which also ye are called in one body; and be ye thankful.
Peace in your heart should be the umpire that decides whether something should be out of your life, or allowed to remain. Many people do not enjoy peace becasue they are out of the will of God. They follow their own will rather than God's will. They do what they feel like or what they think is right rather than following God's Word and being led by peace.
I have learned something can sound good, feel good and even be a good thing..... but if I don't have peace about it, I need to leave it alone. If you want to be sensitive to God's leading learn to follow peace!