John 21:25

And there are also many other things which Jesus did, the which if they should be written every one, I suppose that even the world itself would not contain the books that should be written.

I suppose ... identifies this verse as a separate addendum to the Gospel, probably penned by John himself prior to its being sent to the churches. This statement, with the last two verses of John 20, are a categorical refutation of all critical positions founded on the failure of one Gospel or another to record what was related or omitted by another.

We have found many disagreements with scholars like Alan Richardson; but, despite this, his final words regarding this Gospel are magnificent. He said:

When in faith we have received John's testimony, and have learned from him that JESUS IS THE CHRIST THE SON OF GOD, we shall, from the depth of our inmost conviction, add our testimony to what he has written, and say, WE KNOW THAT HIS WITNESS IS TRUE.[15]

What a marvelous testimony of Jesus Christ is the Gospel of John! Standing near the close of the first century of this era, and after a long and vigorous life of preaching and teaching God's word, the last eye-witness of the ministry of the Lord selected from the incredibly rich storehouse of his blessed memories of Jesus precisely those seven greatest signs of his power and Godhead that he could recall, the same being the great signs he had been preaching for a lifetime; and these he gathered into one final testimony of the divine Christ, launching his Gospel from the platform of a great congregation which attached the corroborative imprimatur of its presbytery. He leveled his witness squarely against the incipient Gnostic heresies beginning, even then, to show themselves in Asia Minor. He designed it so as to refute the false rumors of Peter's unworthiness, due to his denials, and the equally false rumor that the Lord had promised to return within his lifetime. The person of Jesus Christ as both God and perfect man was the theme throughout. There can be no marvel that Satan is very displeased with the Gospel of John; but, despite all satanic opposition to its teachings, the saints of all ages have received it as it is indeed the truth of God, ever rejoicing in its divine revelation of Jesus Christ our Lord.