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John was written by the apostle John, the 'disciple whom Jesus loved' (John 21:20-24). He was the son of Zebedee and brother of James, one of Jesus' closest companions. The Gospel was likely written between 80-95 AD, making it the last Gospel composed. John wrote from Ephesus toward the end of his life.

John contains 21 chapters structured around Jesus' seven miraculous signs (chapters 1-12) and His farewell discourses and passion (chapters 13-21). About 90% of John's material is unique — not found in the other three Gospels — including extensive theological reflections.

The main theme of John is that Jesus is the eternal Son of God, and believing in Him brings eternal life. John's stated purpose: 'these are written that you may believe that Jesus is the Messiah, the Son of God, and that by believing you may have life in his name' (20:31). The seven 'I AM' statements reveal Jesus' divine identity.

Key events include: the Prologue — 'In the beginning was the Word' (1:1-18), the seven signs — water to wine, healing the official's son, healing the paralytic, feeding the 5,000, walking on water, healing the blind man, and raising Lazarus (chapters 2-11), the farewell discourses (chapters 13-17), the crucifixion (chapter 19), the resurrection appearances to Mary Magdalene and Thomas (chapter 20), and the restoration of Peter (chapter 21).

John provides the most theologically developed portrait of Jesus in the Gospels. John 3:16 — 'For God so loved the world that he gave his one and only Son' — is arguably the most famous verse in the Bible. The seven 'I AM' statements (bread of life, light of the world, gate, good shepherd, resurrection and life, way/truth/life, vine) reveal Jesus' divine nature. John's Prologue is the Bible's deepest statement on the incarnation.