The Danger of a Hardened Heart

God clearly stated His purpose for sending the plagues on Egypt: He wanted both the Israelites AND the Egyptians to “know that I am the LORD (Yahweh).” In fact, this is His desire for all of us. But Pharaoh’s “heart was hardened, and he would not listen.” What can we learn from this passage so that we will not respond to God in the same way?