How do we know that grace is central to the gospel?

The centrality of grace in the gospel is affirmed through the unconditional nature of God's promises and the testimony of biblical figures. Stephen's address highlights that the gospel is not based on human merit but solely on God's sovereign grace. This is evidenced by God's actions throughout scripture, from the sacrificial systems established in the Old Testament to the New Covenant promise of forgiveness in Christ. Grace ensures that salvation is not earned but is a gift from God, confirming the loving nature of His plan for redemption.