If you are a Christian, you are not your own. Christ has bought you at a price of his own death. You now belong doubly to God: He made you, and he bought you. That means your life is not your own. It is God’s. Therefore, the Bible says, “Glorify God in your body.” God made you for this. He bought you for this. This is the meaning of your life
John Piper, Don’t Waste Your Life