‘And behold I come quickly (or ‘am coming soon').'
There can be no question but that this is clearly intended to communicate the words of Jesus. It is as though He is there listening and steps in with an interjection. Compare Revelation 1:7 and in this chapter Revelation 22:12; Revelation 22:20. This statement is repeated three times in the chapter to stress its truth. Three is the number of completeness. Those who read this book should know that they need to be ready, for His coming could be at any time consonant with what is in the book. But as with His Father, ‘soon' in eternity is a different conception. He is still coming ‘soon'.
‘Blessed is the one who keeps the words of the prophecy of this book.'
This is a repetition of the words in Revelation 1:3. By ‘keeps' the angel clearly means ‘takes to heart and meditates on them'. The book is to be seen as a prophecy similar to that of the earlier prophets and treated as such, and is to be taken to heart and acted on.