How do we know the concept of grace is true in the Bible?

The concept of grace is pivotal to understanding the biblical narrative of salvation, as seen in the distinctions between the covenant of works and the covenant of grace. The covenant of grace emphasizes that salvation is wholly dependent upon what God does for His people, not what they can do themselves. This is illustrated in various scriptural accounts such as God blessing Noah and Abram, demonstrating that God's grace is unearned and bestowed by His sovereign will. Furthermore, Ephesians 1:3 speaks of God's blessings in Christ as spiritual and eternal, affirming that grace is a foundational truth of the Christian faith.