We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts: Knowing this first, that no prophecy of the scripture is of any private interpretation. For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost. (2 Peter 1:19-21 KJV)
I've noticed that people get all carried away with trying to foretell what will happen in the future by trying to unravel the metaphorical descriptions in the book of Revelation, Daniel and elsewhere. They try to use these verses of Peter in promoting their quest and get people to come hear what they have to say. It's my own opinion, but I don't put much stock in most of what they have to say at these prophesy conferences because, quite frankly, it's a bunch of guess work. If God wanted us to know right down to a tee what and how the future will unfold, He would have put it in plain language. He holds the future in His hands and it's my job to watch and pray.
What these verses are talking about is how our Scriptures came to be and how the prophecy of Christ's birth, death and resurrection came about so that God's elect could be saved. This the sure word of prophecy. This is the light that shines in a dark place, and causes the Light to dawn in people's hearts.
These verses give us assurance that our Scriptures were authored by God, and penned through holy men of God, the prophets of old, as they were moved by the Holy Ghost. The prophecy of old unfolds the plan of salvation.
The key action phrase for us is "where unto ye do well that ye take heed". Are we listening and acting upon what we read in Scripture that is plain to understand? That is far more important than trying to figure out the future of the world from "clues" given in Revelation and elsewhere.