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 I pray for revival I pray first for the most radical thing: The utter devotion and allegiance of your hearts to Christ. That you would love Him so deeply and long for Him so passionately that His coming would be your great hope, and death would be gain, and life would be for Christ and His kingdom.
John PiperOne of the great uses of Twitter and Facebook will be to prove at the Last Day that prayerlessness was not from lack of time.
John PiperChrist did not die to make good works merely possible or to produce a half-hearted pursuit. He died to produce in us a passion for good deeds. Christian purity is not the mere avoidance of evil, but the pursuit of good.
John PiperAccording to the spirit of this age, the ultimate sin is no longer the failure to honor and thank God but the failure to esteem oneself. Self-abasement, not God-abasement, is the evil. And the cry of deliverance is not "O wretched man that I am, who will deliver me?" but "O worthy man that I am, would that I could only see it better"!
John Piper