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 PiperGod is on the move to rescue people from misery to everlasting happiness, which can only be found in him.
John PiperWhen you are deeply peaceful and confident that, because of Christ, God will bring you safely to his eternal kingdom and be the all-satisfying Treasure of your life forever, then you are free to see the truth, and love the truth, and speak the truth no matter what, and joyfully spread a passion for the truth whose name is Jesus.
John PiperThe evil and suffering in this world are greater than any of us can comprehend. But evil and suffering are not ultimate. God is. Satan, the great lover of evil and suffering, is not sovereign. God is.
John Piper