The Lord spoke to her in a way we are not privileged to have today. He speaks today through his word.
God’s choice reverses the natural order, and is not made on the basis of anything intrinsic to man himself. Furthermore, as Paul argues, the choice was made before they were even born or had done good or evil works. It could not therefore have been based on anything in them, but was down to the secret will of God.
But perhaps the greatest lesson here is that a certain theme is kept running that comes all the way from chapter 3. It is the theme of the contention between the church and the world, and the need for the church and the world to be separate. There is no greater disaster than a state church or an empire church. We learn about the separation of the church and the world, and the distinctiveness of the church of God's people. We have seen it before where the people think unity is vital, the unity of the race, unity of the family, and God separates them. But they come back together and he separates them again. The same thing happens in this chapter. It is a lesson that repeats. It is a cable or a thread, as you would call it today, that runs through these chapters, and yet today, people are blind to it. In a season when the church is marrying the world all the time and adopting worldly dress, worldly music, worldly methods, wholesale, people fail to look at this obvious theme which dominates these chapters in Genesis.