How do we know grace is sufficient through Christ?

Grace is fundamentally defined as unmerited favor, and its sufficiency is vividly illustrated in the context of Christ's atoning work. Zechariah emphasizes that this grace meets the desperate needs of sinners who recognize their unworthiness. As the text alludes to the historical figures like Abel and Noah, we see that grace was available to them, showcasing God's enduring mercy across generations. Ultimately, the New Testament fulfills this in Christ, who secures grace for His people through His death and resurrection. Believers benefit from this grace, experiencing regeneration and the promise of eternal life, assuring them that their sins are forgiven and they are made new in Christ.