How do we know that Christ's sacrifice is sufficient?

The assurance of Christ's sacrifice lies in its completeness—He bore the iniquities of His people (Isaiah 53:6) and satisfied God's demands for justice. The notion that He could not fail to redeem those the Father had given Him reinforces the belief that all required for salvation has been accomplished on our behalf (John 6:39). As our surety, He not only paid our sin debt but also fulfilled the law's requirements, ensuring that there is no condemnation for those who are in Christ Jesus (Romans 8:1). The Scriptures affirm that God was satisfied with the sacrifice of His Son, proving that it was sufficient to secure the eternal redemption of His elect.