What role does God's grace play in giving us a new heart?

God's grace is central to the promise of a new heart as described in Ezekiel 36:21. The text reflects God's act of pity and grace upon a people who are undeserving. It emphasizes that without God’s intervention, humanity remains in a state of hardness and rebellion. The grace of God is the driving force behind the regeneration that leads to a transformed heart and spirit. This highlights the Reformed understanding of sovereignty in salvation—that it is God who sovereignly grants a new heart, ensuring the believer's response is purely a result of His unmerited favor.