How do we know that Christ's sacrifice was sufficient for our salvation?

The sufficiency of Christ's sacrifice rests on the foundation of His unique and sinless nature. According to Scripture, God ordained that no bones of the Passover Lamb would be broken (Exodus 12:46), and this was reflected in Christ's own crucifixion, confirming His status as the perfect sacrifice. Jesus' death accomplished what was foreshadowed in the Old Testament sacrifices; He fully satisfied the demands of a holy God regarding sin. Furthermore, the miraculous flow of blood and water indicates not only His death but the completion of an atonement that was both just and merciful.

This is reinforced throughout Scripture, particularly in passages such as Romans 8:3-4, where Paul explains that God condemned sin in the flesh of His Son, enabling the righteous requirement of the law to be fulfilled in believers. Consequently, there is no condemnation for those who are in Christ Jesus (Romans 8:1). The entirety of Christ’s work provides evidence for its sufficiency—His sacrifice is a once-and-for-all event that accomplished redemption for sinners.