What does the Bible say about God's sovereignty in hardening hearts?

In the context of Pharaoh's interactions with Moses, we see God's sovereignty at play. God had explicitly informed Moses that He would harden Pharaoh's heart (Exodus 4:21). This hardening was not arbitrary; it served a divine purpose, allowing God to display His power and solidify His distinction between His chosen people and the Egyptians. God's act of hardening Pharaoh’s heart was integral to demonstrating His authority over creation and His plan for the Israelites' deliverance. This theme of God's sovereignty in the face of human decisions underscores the Reformed understanding that God orchestrates events for His glory, illustrating that human free will operates within God's sovereign will.