‘This is the disciple who has written these things, and his testimony is true.’
Acts 28:16-20, 30-31; Ps 11(10):4. 5, 7.; John 21:20-25
The ending to John's Gospel has a reassuringly human touch to it. The evangelist seems to be saying that he could have gone on writing more and more - but also that what he has written is enough.
Would it have been better if more had been written, or is it better that we are left with more to think about, and to trust that we have enough? That is somewhat hard to say. Scholarly arguments have developed about the authorship of those last two sentences. Was John found, perhaps early one morning, having passed away and the final text he wrote being ‘If it is my will that he remain until I come, what is that to you?’
It would be a loving touch to add the editorial - to round it off with the epitaph almost, that John was a first person witness, and maybe the last first person witness alive of the events and life of Jesus. We can not be sure about that, but we can be sure that John's Gospel has an attractive sense of personal relationship with Jesus.