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John
John’s gospel was the last written; his style and content differs much from the other gospels. Most of the book covers only 3 weeks in the life of Jesus with John devoting 10 chapters to the final week before the crucifixion. John’s purpose for writing is so that you might believe that Jesus is the Christ, and you might have life through His name (John 20:30-31); he chooses specific events from the life of Jesus to meet that goal.
John was in the “inner circle” of disciples (which included Peter and James also) and many times had first-hand experience of events the other disciples didn’t. John was also the last disciple alive (even Paul was gone) and possessed considerable apostolic authority — his account is authoritative and provides details not found in the other gospel accounts.