Det går att på mycket goda grunder argumentera för att Johannesevangeliet skrevs av ett ögonvittne, och till och med att det skrevs tidigt, alltså innan Jerusalems förstöring.
As we have seen through this brief evaluation, the Gospel of John appears to have been penned by someone who had accurate knowledge of the topography of both Galilee and Judea from the time before the Jewish War of AD 70. The author of this text was familiar with the town of Bethsaida, which was a name in use during the days of Jesus’ ministry yet had changed by AD 34. He correctly identified the location of the pool by the Sheep Gate with five porticoes, although it had been covered over for centuries. His text appears to have been written in such a way that implies these landmarks were still standing at the time of his writing. The names we find throughout this Gospel, when combined with names from the other Gospels and Acts, appear to be ones we would expect to find among Jewish Palestinian males at this time and in just the right proportion. And finally, the author of this text did not attempt to secure credibility by what he wrote but appears to have already had sufficient authority in the earliest days of the Christian church.