Grace is not cheap. Grace comes at the price of the Father sending his Son into the world for the very purpose of dying for those chosen before the foundation of the world for salvation. Jesus comes on a rescue mission that not one of us deserve. He came to seek and save the lost. He was perfectly fine in heaven fellowshipping with his Father and the Holy Spirit. Yet because of his love he comes to dwell among those whom he created and who would crucify him on a cross like they would a criminal. In Romans 5, Paul has been driving this point home: "For while we were weak...Christ died for the ungodly. God shows his love for us in that while we were yet sinners, Christ died for us. For if while we were enemies we were reconciled to God by the death of his Son" (Rom. 5:6,8,10). Paul knows grace will melt a hard heart. He knows God's love will in turn cause sinners to turn and love him.
Grace changes people. Grace changes sinners to saints. It changes enemies to friends. It changes the unreconciled to the reconciled. Grace produces change! This change is why Paul is confident to preach grace and grace alone. He knows when grace is preached, God will work. When God works, people die to sin and are changed. He knows God makes people alive to him and dead to sin. "How can we who died to sin still live it?" We can't because of grace.
Grace upon grace,