In many ways the Gospel of John remains a mystery—it hints at who its author is and yet never explicitly tells us. The story seems simple and straightforward, and yet one feels as though the author is often hinting at still deeper truths. In the New Testament it stands alone, distanced from the Synoptics by its unique presentation of the Christ-event.
Of the four gospels, John is by far the most poetically written and the most distinct in terms of style, narrative and approach. While there are varying theories about who wrote it and when, it can be agreed on that the Gospel of John was written for not only a very different audience than the synoptic gospels, but also written independently of them. This can be seen in the basic language that it is written in, and can also be seen because there is no mention anywhere of the parables, Jesus' primary teaching method according to the synoptic gospels. Instead, John makes use of miracles and uses examples from Jesus' ministry to demonstrate his power and divinity. He uses his power over nature to raise people from the dead, heal a blind man and feed 5000 people with the physical amount of food for only a few.

The gospel narrative contains a series of "signs"--the gospel's word for the wondrous deeds of Jesus. The author is primarily interested in the significance of these deeds, and so interprets them for the reader by various reflections, narratives, and discourses. The first sign is the transformation of water into wine at Cana (John 2:1-11); this represents the replacement of the Jewish ceremonial washings and symbolizes the entire creative and transforming work of Jesus. The second sign, the cure of the royal official's son (John 4:46-54) simply by the word of Jesus at a distance, signifies the power of Jesus' life-giving word. The same theme is further developed by other signs, probably for a total of seven. The third sign, the cure of the paralytic at the pool with five porticoes in ch 5, continues the theme of water offering newness of life. In the preceding chapter, to the woman at the well in Samaria Jesus had offered living water springing up to eternal life, a symbol of the revelation that Jesus brings; here Jesus' life-giving word replaces the water of the pool that failed to bring life. John 6 contains two signs, the multiplication of loaves and the walking on the waters of the Sea of Galilee. These signs are connected much as the manna and the crossing of the Red Sea are in the Passover narrative and symbolize a new exodus. The multiplication of the loaves is interpreted for the reader by the discourse that follows, where the bread of life is used first as a figure for the revelation of God in Jesus and then for the Eucharist. After a series of dialogues reflecting Jesus' debates with the Jewish authorities at the Feast of Tabernacles in John 7; 8, the sixth sign is presented in John 9, the sign of the young man born blind. This is a narrative illustration of the theme of conflict in the preceding two chapters; it proclaims the triumph of light over darkness, as Jesus is presented as the Light of the world. This is interpreted by a narrative of controversy between the Pharisees and the young man who had been given his sight by Jesus, ending with a discussion of spiritual blindness and spelling out the symbolic meaning of the cure. And finally, the seventh sign, the raising of Lazarus in ch 11, is the climax of signs. Lazarus is presented as a token of the real life that Jesus, the Resurrection and the Life, who will now ironically be put to death because of his gift of life to Lazarus, will give to all who believe in him once he has been raised from the dead.
After the account of the seven signs, the "hour" of Jesus arrives, and the author passes from sign to reality, as he moves into the discourses in the upper room that interpret the meaning of the passion, death, and resurrection narratives that follow. The whole gospel of John is a progressive revelation of the glory of God's only Son, who comes to reveal the Father and then returns in glory to the Father. The author's purpose is clearly expressed in what must have been the original ending of the gospel at the end of John 20: "Now Jesus did many other signs in the presence of [his] disciples that are not written in this book. But these are written that you may [come to] believe that Jesus is the Messiah, the Son of God, and that through this belief you may have life in his name."