‘And there are also many other things which Jesus did, the which if every one of them should be written I suppose that even the world itself would not contain the books that would be written.'
The first person ‘I' suggests that this was then finally appended by the writer himself. It may, however, have been added later, possibly when the four Gospels were put together. The early Codex Sinaiticus originally did not have the verse and then added it later. It stresses what we would do well to remember that much of what Jesus did and taught we will never know. What we can be sure of is that we have a good grounding in it in the Gospels, and it is a testimony to their accuracy that no attempt was made to publish anything that was not fully verified as an important part of the tradition of the disciples used in the witness of the church.