Some thoughts from Exodus 9:27-35 (ESV)
The hard-heartedness of Pharaoh feigned repentance but reverted to his old ways as soon as the danger passed.
There is a pattern to pride and this account of dealing with Pharaoh may show it to us more than any other in the Bible. Despite the mouthing of the words, Moses must have picked up something in the tone of the “confession” of the king. He tells Pharaoh, I know that you do not yet fear the Lord God. Can you imagine what it will take to get the king to fear the Lord? As you read ahead in Exodus, you will discover that even the last plague was not enough to cause such a fear in Pharaoh! Thus we see the reality of pride’s insipient pervasiveness.
Little can erode the hard heart, and that may also include the supernatural interventions of the Almighty God.
Have you experienced someone who is unmovable about God’s work in their lives?