The gospel isn’t simply the ABC’s of Christianity, but the A-through-Z. The gospel doesn’t just ignite the Christian life; its the fuel that keeps Christians going everyday. Once God rescues sinners, his plan isn’t to steer them beyond the gospel but to move them more deeply into it. After all, the only antidote to sin is the gospel–and since Christians remain sinners even after they’re converted, the gospel must be the medicine a Christian takes every day. Since we never leave off sinning, we can never leave the gospel.
– Tullian Tchividjian, from Surprised by Grace