Barnes New Testament Notes

Verse 18. For I testify. The writer does not specify who is meant by the word "I" in this place. The most natural construction is to refer it to the writer himself, and not to the angel, or the Saviour. The meaning is, "I bear this solemn witness, or make this solemn affirmation, in conclusion." The object is to guard his book against being corrupted by any interpolation or change. It would seem not improbable, from this, that as early as the time of John books were liable to be corrupted by additions or omissions, or that at least there was felt to be great danger that mistakes might be made by the carelessness of transcribers. Against this danger, John would guard this book in the most solemn manner. Perhaps he felt, too, that as this book would be necessarily regarded as obscure from the fact that symbols were so much used, there was great danger that changes would be made by well-meaning persons with a view to make it appear more plain.

Unto every man that heareth the words of the prophecy of this book. The word "heareth" seems here to be used in a very general sense. Perhaps in most cases persons would be made acquainted with the contents of the book by hearing it read in the churches; but still the spirit of the declaration must include all methods of becoming acquainted with it.

If any man shall add unto these things. With a view to furnish a more full and complete revelation; or with a profession that new truth had been communicated by inspiration. The reference here is to the book of Revelation only -- for at that time the books that now constitute what we call the Bible were not collected into a single volume. This passage, therefore, should not be adduced as referring to the whole of the sacred Scriptures. Still, the principle is one that is thus applicable; for it is obvious that no one has a right to change any part of a revelation which God makes to man; to presume to add to it, or to take from it, or in any way to modify it. Compare Barnes on "2 Ti 3:16".

God shall add unto him the plagues that are written in this book. Th se "plagues" refer to the numerous methods described in this book as those in which God would bring severe judgment upon the persecutors of the church, and the corrupters of religion. The meaning is, that such a person would be regarded as an enemy of his religion, and would share the fearful doom of all such enemies.

{d} "add" Pr 30:6