How do we know that the atonement of Christ is sufficient for salvation?

The sufficiency of Christ's atonement is a core doctrine of Reformed theology, affirmed through the Scriptures that declare His work as complete and satisfactory for the redemption of sinners. Romans 3:23-26 highlights that all have sinned and fall short of the glory of God, but through faith in Jesus, believers are justified freely by God's grace, demonstrating the justice of God in giving Christ as the propitiation for sin.

Moreover, Jesus asserts in John 14:6 that He is the way, the truth, and the life, indicating that access to the Father is only through Him. This underscores the belief that His atoning sacrifice is sufficient to satisfy divine justice, providing not only forgiveness of sins but also the righteousness needed for acceptance with God. The work of the Spirit complements this by bringing the sinner to recognize and embrace this complete work of Christ, ensuring that the glory remains with Jesus and not the Spirit’s inward work. Ultimately, the assurance of salvation lies in the perfect obedience and sacrifice of Christ alone, allowing sinners to rest securely in His finished work.