The Sin of A Hardened Heart

The universalists come out say that this is not fair. A loving God has to treat all men the same. He can't judge one and bless another.
Oh, no! Well, He does so all the time. God has an elect people, whom he saves and blesses and there are the non-elect called the reprobate and they are left to their wicked ways and are fitted for destruction. See 1Peter 2:8 – 9.
The opposite side of election is reprobation. If you are not one of God's elect you are appointed to wrath.
Is this fair?
Well that is the whole tenor of the subject in Romans 9:13 – 24.
Paul foresaw the objection of proud man – man who would put himself on a level plane with God and dare to ask, “What doest thou?”
Paul reminds us that God is the Sovereign. We are the subjects. He is Creator, we are the creature. God is the potter and we are the clay.
God's final word is given: “Therefore hath he mercy on whom he will have mercy, and whom he will he hardeneth.” V18.
The grand example of that is Pharaoh hardening his heart – v 17
So let us have a closer look at Pharaoh and see how God deals sovereignly with every man.