What does the Bible say about salvation by grace alone?

Salvation by grace alone is a foundational doctrine in Christian theology, rooted in Scriptures such as Ephesians 2:8-9, which states, 'For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast.' This emphasizes that human efforts cannot contribute to salvation. The doctrine underscores that salvation is entirely an act of God's divine grace, reflecting His mercy toward sinners who are otherwise deserving of condemnation due to sin. In Reformed theology, grace is understood as unmerited favor bestowed upon the elect and is essential for the transformation of the heart and mind necessary for true faith.