Much discussion has been had over the centuries about how God hardens the heart of man. Entire complex theological perspectives derive from the various given answers. Nonetheless the question remains within the often tossed to and fro hearts of man, but the truth remains consistently clear and easy to understand.
Jeremiah 36-39 are chapters that reveal no less than three things: 1) The hearts of unbelievers, 2) The hearts of believers, and 3) The consistency of God’s word. Throughout these chapters you will find hearts that demanded Jeremiah change the message – but when Jeremiah was asked about the same topic over and over he gave the same answer from God over and over. The result? Unbelieving hearts that grew increasingly resistant, hardened and hostile toward God’s unchanging word.
So again, how does God harden the hearts of man? Study anyone from the Pharaoh of Exodus to the Pharisees of Jesus’ day, and whoever came before them or after them, and you will find that man’s heart is hardened and his moral depravity increases when he resists and refuses to review, relent, repent and become restored by the unchanging message of God’s word and not by some arbitrary “sovereignty” that resigns certain individuals to Heaven or Hell from birth.
If the Philistines, at one point in time, could understand this simple principle of God (1 Samuel 6:6), then why not the people of today?
“You stiff-necked and uncircumcised in heart and ears! You always resist the Holy Spirit; as your fathers did, so do you.” (Acts 7:51, NKJV)