From David Hansen’s The Art of Pastoring:

The call to repent assaults the Old Adam in us:  the life of the flesh, our involvement in the sinful structures of this world, our stubborn refusal to yield to God’s will.  We cherish our sin, we clutch it, it kills us but we love it.  The gospel demands we choose life, rejecting sin and its ungodly demands.  So the love of God in the gospel works like a surgeon.  Cutting out sin’s cancer, with pain like death, the gospel heals.”   (pages 38-39)