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).