Romans 9:18 So then he has mercy on whomever he wills, and he hardens whomever he wills.
The actions of God cause those for whom he has mercy to respond as they do. They are regenerated by the Holy Spirit and seek God and his righteousness as a result of God’s initiative. Those to whom God chooses to show no mercy are left in their sinful nature. They are slaves to that nature and many are further hardened by his wrath to suit his purposes. Perhaps God removed a restraining grace from Pharaoh that resulted in his actions. Whatever the dynamics are that bring about God’s will of decree, it is not up to human beings to question or quarrel with God’s methods or actions as Paul goes on to explain.
Focus on Christ #143