The Apostle Paul finishes his defence of the good news that we don’t have a list of laws to live up to, we have a new identity to live out of. This new identity is ours by God’s grace alone and is received through faith in Jesus Christ, not by any effort of our own. Having argued for the gospel from their personal experience, Scripture, history, reason and their relationship with Paul; the closing argument is an analogy from the life of Abraham and his two wives. It’s a powerful illustration of what it means to be children of Promise. Placing our faith in God to fulfil all His promises is the only way for us to have true fellowship with God and each other, for us to live in freedom from sin and law and finally, for our lives to bear good fruit – fruit that we cannot produce by our own efforts.