How do we know that Christ's work is sufficient for our righteousness?

The sufficiency of Christ's work for our righteousness is rooted in the doctrine of justification by faith. Through His obedience unto death, Christ satisfies the just requirements of God’s law. He took upon Himself the sins of His people, acting as their surety and substitute. Hebrews 10:14 declares, 'For by one offering he hath perfected for ever them that are sanctified.' This perfection signifies that God's justice is fulfilled, allowing us to be reconciled to Him. Thus, we can be assured that our righteousness before God is secure in Christ alone.