Sin is what you do when your heart is not satisfied with God. No one sins out of duty. We sin because it holds out some promise of happiness. That promise enslaves us until we believe that God is more to be desired than life itself (Psalm 63:3). Which means that the power of sin's promise is broken by the power of God's.
John PiperDo you feel more loved when God makes much of you or do you feel more loved when God at the cost of His Son allows you to make much of Him?
John PiperI know of no other way to triumph over sin long-term than to gain a distaste for it because of a superior satisfaction in God.
John PiperHusbands and wives, recognize that in marriage you have become one flesh. If you live for your private pleasure at the expense of your spouse, you are living against yourself and destroying your joy. But if you devote yourself with all your heart to the holy joy of your spouse, you will also be living for your joy and making a marriage after the image of Christ and His church.
John Piper