How do we know Christ's work of redemption was successful?

The doctrine of successful redemption rests upon the assurance that Jesus Christ's death on the cross was sufficient to pay the penalty for the sins of His people. As stated in Isaiah 53:5-6, 'He was wounded for our transgressions; He was bruised for our iniquities; the chastisement of our peace was upon Him, and with His stripes, we are healed.' This affirms that Christ bore the sins of His chosen, fulfilling the requirements of divine justice. With His resurrection, He demonstrated His victory over sin and death, ensuring that those for whom He died will not perish but have eternal life (John 3:16).