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 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 great barrier to worship among God's people is not that we are always seeking our own satisfaction, but that our seeking is so weak and half-hearted that we settle for little sips at broken cisterns when the fountain of life is just over the next hill.
John PiperNot going to God because your faith is weak is like not going to the doctor because you feel sick.
John PiperThe greatest stumbling block for children in worship is that their parents do not cherish the hour. Children can feel the difference between duty and delight. Therefore, the first and most important job of a parent is to fall in love with the worship of God. You can't impart what you don't possess.
John Piper