From salvation and the assurance of salvation, we turn to Satan and the activity of Satan. Sarai came with temptation (1). Abraham yielded to temptation (2). Temptation becomes sin when we yield to it. In Abraham, we see the conflict between ‘the old man’ that he was and ‘the new man’ God was calling him to become (17:5; Galatians 5:17). He chose the way of unbelief. Listening to the voice of Satan, speaking through Sarai, he walked straight into immorality. Unbelief and immorality belong together (Romans 1:18). We must guard our hearts with respect to both what we believe and how we behave. We must not imagine that Satan will win the victory over the Lord and His purpose of salvation. Satan will try to overcome God’s gracious purpose, but he will not succeed (Revelation 20:10). ‘Hallelujah!… the Lord our God the Almighty reigns’(Revelation 19:6).
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).