For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book:
God's character seals this book: He is faithful and true, and He would never send His holy angels to deceive His saints with mere dreams. That the angel refused John's worship, reproved him for it, and the apostle confesses his own relapse into folly shows a sincerity no deceiver would display. The book stands open for all to study, compare, and test against what comes to pass.
AI summary
Commenting on Revelation 22:6-19
For I testify to every man,.... These are not the words of a scribe, who having wrote out a copy of this book, added the following adjuration to it, to deter persons from adding to it, or diminishing it; for the book is not yet finished, and both Christ and John speak after this; and to insert such a passage into the text would be...
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.