In Exodus, we see a downward spiral of Pharaoh as his heart is continually hardened. The Bible speaks of Pharaoh's heart in multiple ways, saying that both God and Pharaoh were the causes of his hard heart. How are we to understand this, especially as we want to understand our own hearts before the Lord?
"And I will give you a new heart, and a new spirit I will put within you. And I will remove the heart of stone from your flesh and give you a heart of flesh." Ezekiel 36:26