"The hardening of Pharaoh's heart is a warning to all of us. If the sinful human heart doesn't respond by faith to God's Word, it cannot be transformed by the grace of God (Ezek. 36:26-27; Heb. 8:7-13). Instead, it will become harder and harder the longer it resists God's truth. No matter how often God may send affliction, it will only provoke more disobedience. In the last days, when God sends His terrible judgments on the world (Rev. 6--16),10 people will curse God and continue in their sins, but they will not repent (6:15-17; 9:20-21; 16:9, 11). There will be a whole world full of men and women like Pharaoh who will behold God's judgments and still not repent. "Today, if you will hear His voice, do not harden your hearts" (Heb. 3:7-8 NKJV)."