Then too, the authority which the author wields within the text can also be best explained if written by John the Apostle:
It is worth noting that the author of the Apocalypse exercised an authority over the Asian churches that went beyond that normally associated with NT prophets. This leads to the conclusion that although he wrote as a prophet, he functioned among his churches as an apostle.1
He commends the Church of Ephesus for trying and convicting them which say they are apostles , and are not, by which he implies his own undoubted claim to apostolic inspiration (Rev. Rev. 2:2+), as declaring in the seven epistles Christs will revealed through him.2
2 A. R. Fausset, The Revelation of St. John the Divine, in Robert Jamieson, A. R. Fausset, and David Brown, A Commentary, Critical and Explanatory, on the Old and New Testaments (Oak Harbor, WA: Logos Research Systems, Inc., 1997, 1877), Rev. 1:1.