Amazing grace – this is the marvellous theme of this chapter. Abram became Abraham (5). Sarai became Sarah (15-16). What they were belonged to their sinful past. What they became was the work of God’s grace. What a contrast there is between human sin and divine grace. We look at ourselves. We see sin, and we lose hope. We look at the God of grace, and we say, ‘Sin shall not have dominion. Grace is victorious’ (Romans 6:14). Abram and Sarai appeared to be hopeless cases. They had failed the Lord, but He did not fail them. He made them new people. They became the father and mother of nations. To those who do not deserve His love, God still renews His ‘covenant’, His promise of love (2). He still says, ‘I have loved you with an everlasting love’ (Jeremiah 31:3). In the Cross of Christ, we have the greatest ‘sign of the covenant’ (11; Romans 5:8).