How do we know the doctrine of restoration is true?

We understand the doctrine of restoration through scriptural narratives, especially seen in John 21 where Jesus restores Peter after his denial. This act illustrates not only Peter's restoration but establishes a theological truth about how God works with His children—offering grace even in failure. The narrative shows that Christ is intimately involved in the lives of His followers, ready to restore and forgive. This aligns with the nature of God as depicted throughout scripture, who is gracious and merciful. Further, it reinforces the belief that no failure is beyond the reach of God's redeeming love, thus affirming the doctrine of restoration within Christian faith.