The revelation from Jesus Christ, which God gave him to show his servants what must soon take place. He made it known by sending his angel to his servant John, (Revelation 1:1 NIV)
Some Christians prefer to ignore the book of Revelation, and say that it is symbolic and that the events described in it won’t really happen. But John, when he wrote this book, claimed that it is an important message from Jesus to those who believe in Him, and that the things it talks about will take place soon. We must be prepared for them.
Some might ask, how can these things in the book of Revelation take place “soon” since the prophecy was written almost 2,000 years ago? The answer to this question is given by the Apostle Peter in one of his Epistles:
Above all, you must understand that in the last days scoffers will come, scoffing and following their own evil desires. 4 They will say, “Where is this ‘coming’ he promised? Ever since our ancestors died, everything goes on as it has since the beginning of creation.” 5 But they deliberately forget that long ago by God’s word the heavens came into being and the earth was formed out of water and by water.6 By these waters also the world of that time was deluged and destroyed. 7 By the same word the present heavens and earth are reserved for fire, being kept for the day of judgment and destruction of the ungodly.
8 But do not forget this one thing, dear friends: With the Lord a day is like a thousand years, and a thousand years are like a day. 9 The Lord is not slow in keeping his promise, as some understand slowness. Instead he is patient with you, not wanting anyone to perish, but everyone to come to repentance. (II Peter 23:3-9)
So we see, that with God, two thousand years is a very short time (i.e. like two days to God). The fact that God has waited this long does not mean that these things will not happen, but rather that God is gracious and loving, giving us a chance to repent of our sins and be spared before the day of judgment comes.