How do we know grace is the basis of our salvation?

The scriptural basis for salvation through grace is emphasized in Titus 2:11, which states that 'the grace of God that bringeth salvation hath appeared to all men.' This grace is not earned or achieved through our works but is a gift from God, manifesting His mercy and love. Additionally, Ephesians 2:8-9 reaffirms that it is by grace we are saved, through faith, and this is not of ourselves; it is the gift of God, ensuring that no one can boast. Therefore, grace is the foundational truth of the gospel, revealing God's efforts to save unworthy sinners.