"And BEHOLD, I AM COMING QUICKLY.
The Lord Himself seems to step forward at this point to confirm the urgency with which the Revelation (visions - Habakkuk 2:1-3) will take place and complete (2 Peter 3:1-3-9-13). Recall that we have heard this before in the discussion with the Philadelphian church (Revelation 3:7-13). They were advised to hold on even through the hour of testing (Revelation 3:10). Those who held on, the overcomers, get to live in the new Jerusalem (Revelation 3:12). Where have we heard about this new Jerusalem (Revelation 21:1-22:5)?
BLESSED is he who HEEDS the WORDS of the PROPHECY OF THIS BOOK."
This is the parallel of Revelation 1:3 accept that by now we will have read and heard the WORDS of THIS BOOK. So here we only are left to HEED the WORDS of the PROPHECY OF THIS BOOK.
"BLESSED" means highly favored to the point of contented happiness. That truly is a BLESSING in today's evil world. Interestingly, many Christians don't even attempt to read the Revelation because they feel it is too difficult to understand. But this verse implies that it can be understood. I encourage you if you are confused by these WORDS in the Revelation to reread and reread this book. Through a sincere desire to understand the Revelation, the Holy Spirit will lead you (John 16:12-13-15).
Be aware, however, that it is the WORDS found in the Revelation itself that must be HEEDED. DO NOT COUNT on the explanatory words this author has placed on this website. They are for guidance ONLY. It is the WORD exclusively in the Revelation (verses 18-19) to be HEEDED.