Why is God's grace important for overcoming sin?

God's grace is vital for overcoming sin as it assures believers that their standing before God does not rely on their efforts. Romans 6:14 states, 'You are not under the law, but under grace,' indicating that our power to resist sin comes from understanding and relying on the grace that was extended to us through Christ. His substitutionary atonement allows us to claim victory over sin through faith, as we acknowledge our inability to earn righteousness and accept His divine enablement instead.