Why is it important that salvation is by grace alone?

The significance of salvation by grace alone lies in its affirmation of God's sovereignty and the futility of human effort to attain righteousness. Ephesians 2:8-9 highlights that salvation is not based on works, so no one can boast. Our inability to achieve holiness through our actions accentuates the necessity of God’s grace—unmerited favor. This grace is provided through the sacrificial work of Christ, who fulfilled the requirements of the law on our behalf, allowing sinners to be justified freely by His grace through faith.