Out of the freedom from worry that God's generosity provides comes an impulse toward simplicity rather than accumulation.
John PiperThe importance of prayer rises in proportion to the importance of the things we should give up in order to pray
John PiperSin 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 PiperThe call of God creates sight in us. It's the work of God in our hearts to awaken us before his word.
John Piper