QUOTE : What does it mean to harden your heart? It means to see clear evidence of the hand of God at work and still refuse to accept His Word and submit to His will. It means to resist Him by showing ingratitude and disobedience and not having any fear of the Lord or of His judgments. Hardhearted people say with Pharaoh, “Who is the LORD that I should obey His voice?” (5: 2) ...The same sun that melts the ice also hardens the clay. It all depends on the nature of the material (p. 41).