What is the main theme in the Bible book of John?
The main theme in the Bible book of John is to prove conclusively that Jesus is the Son of God and that all who believe in Him will have eternal life. The key verses of the book of John are John 20:30-31 where we are told, "Jesus did many other miraculous signs in the presence of his disciples, which are not recorded in this book. But these are written that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in his name."
The history of John the disciple of Jesus was well known. He was the son of Zebedee, brother of James and called a "Son of Thunder." The book of John was written after the destruction of Jerusalem, in A.D. 70 and before John's exile to the island of Patmos.
Of the eight miracles recorded in this book, six are unique, (among the Gospels), to John, as is the "Upper Room Discourse" (chapters 14-17). Over 90 percent of John is unique to his Gospel - John does not contain a genealogy or any record of Jesus birth, childhood, temptation, transfiguration, appointment of the disciples, nor any account of Jesus parables, ascension, or great commission.
In every chapter, Jesus deity is revealed and Jesus identity is understood by the titles He is given. The titles of Jesus in the gospel of John includes Son of God, Messiah, the Word, the only Son, Lamb of God, true bread, life, resurrection, and vine. And the formula is "I am." When Jesus uses this phrase, He affirms His preexistence and eternal deity. Jesus says, I am the bread of life (6:35); I am the good shepherd (10:11, 14); I am the resurrection and the life (11:25); I am the way, the truth, and the life (14:6); and I am the true vine (15:1).
John makes it clear that Jesus is not just a man; He is the eternal son of God. Because Jesus is God's Son, we can perfectly trust what He says. By trusting Him, we can gain an open mind to understand God's message and fulfill His purpose in our lives.
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