How does grace reign over sin according to the Bible?

Romans 5:21 teaches that as sin reigns unto death, so grace reigns through righteousness unto eternal life by Jesus Christ our Lord. This means that while sin leads to condemnation, the grace offered through Christ's redemptive work has the power to grant life and victory. It's not just a counter to sin; it transforms the believer, regenerating their hearts and enabling them to live in obedience. This reign of grace is a crucial aspect of what it means to live under the New Covenant, rooted in sovereign grace and the assurance of salvation.