" And they said to him, "We are able." And Jesus said to them, "The cup that I drink you will drink; and with the baptism with which I am baptized, you will be baptized. You always present our great Catholic Faith in a clear and concise manner. Are you able to drink the cup that I drink, or to be baptized with the baptism with which I am baptized?

The editors of John make it abundantly clear that they have some sort of hand in the composition of the Gospel, but that the Gospel is nonetheless rooted in the testimony of the "beloved disciple" whom they know intimately.

The discrepancy in writing styles between the Gospel and Revelation, therefore, could be due to any number of factors.

It may be that John wrote his Gospel with the help of another person named John (then, as now, a common name).

It may be that he had no when he wrote Revelation (which would explain the different styles and the difference in competence in Greek).

None of this disproves the strong evidence that John bar-Zebedee is the source of the testimony in the Gospel.

Likewise, the attempt to pit Mark -39 against the testimony of John 21 is what happens when those who set out to disprove everything in the Bible undertake biblical interpretation.

In their zeal to prove it is not God’s book, these determined misreaders wind up forgetting that it is a human book using human language.

Certainly not the beloved disciple, according to "modern scholarship," which claims the book is more or less unhistorical fantasy written by a pseudonymous author. Some critics, eager to look for cracks in the evidence, will note that the Greek of John’s Gospel and epistles is a different quality than the Greek of John’s Revelation.

180) that the fourth Gospel was written by the apostle John, the teacher of Irenaeus’s mentor Polycarp.