How do we know that Christ's mission was successful?

The scripture assures us of the effectiveness of Christ's mission through Isaiah 42, where it states that 'He shall not fail, nor be discouraged'. This promise indicates that every aspect of His redemptive work, including suffering, sacrifice, and ultimately His resurrection, was part of God's perfect plan. The fulfillment of prophecy and the establishment of new covenants confirm His success in securing salvation for His people.

Additionally, the doctrine of justification emphasizes that those who believe in Christ are made righteous not through their own works but through His completed work on the cross. His ability to remain faithful, despite opposition and trials, is a testament to His divine authority and assurance that He would complete His mission. Christ's perfect servanthood assures us that all His work results in the eternal redemption of those chosen by God.