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The average reader would conclude that John completed his book with the dramatic testimony of Thomas (John 20:28-31), and the reader would wonder why John added another chapter. The main reason is the apostle Peter, John’s close associate in ministry (Acts 3:1). John did not want to end his gospel without telling his readers that Peter was restored to his apostleship. Apart from the information in this chapter, we would wonder why Peter was so prominent in the first twelve chapters of the book of Acts.
John had another purpose in mind: He wanted to refute the foolish rumor that had spread among the believers that John would live until the return of the Lord (John 21:23). John made it clear that our Lord’s words had been greatly misunderstood.
I think John may have had another purpose in mind: He wanted to teach us how to relate to the risen Christ. During the forty days between His resurrection and ascension, our Lord appeared and disappeared at will, visiting with the disciples and preparing them for the coming of the Spirit and their future ministries (Acts 1:1-9). They never knew when He would appear, so they had to stay alert! (The fact that He may return for His people today ought to keep us on our toes!) It was an important time for the disciples because they were about to take His place in the world and begin to carry the message to others.
I see in this chapter three pictures of the believer and a responsibility attached to each picture.