The obvious answer is: "Read the book. What he writes about in it... he saw."
"...Suddenly, I heard a loud voice behind me, a voice that sounded like a Trumpet blast. It said, 'WRITE DOWN WHAT YOU SEE...' " (Rev.1:10-11 NLT New Living Translation)
And so, of course, that's what John did:
"Then as I looked, I SAW A DOOR standing open in heaven..." (Rev.4:1 NLT).
"And I SAW A SCROLL in the right hand of the One who was sitting on the throne..." (Rev.5:1 NLT).
"And I SAW A STRONG ANGEL..." (verse 2).
"I looked and I SAW A LAMB that had been killed but was now standing between the throne and the four Living Beings..." (verse 6).
And so, throughout the book of Revelation, John "wrote down what he saw."
However... what John saw was a "vision" of the future. The future yet ahead of us, today, even. It was a vision of the "Days" just before Jesus Christ returns to earth with the Government of God... with a visionary look at what comes after [if you read the latter chapters of the book].
Because John tells us the "time frame" of his "Spiritual Vision":
"I was in the Spirit on the LORD's Day, and I heard a loud voice behind me..." (Rev.1:10 MNT Montgomery New Testament).
But because the visions in the book of Revelation given to John were written down as one big "parable," which Jesus used, exclusively, when speaking to the general public so that they wouldn't understand what He was saying -- so are John's words extensively misunderstood by the world.
Subsequently, many folks think John was talking about "Sunday" as the "LORD's Day" in verse 10, above, as for the "time frame" of his vision. They think John was talking about a "day of the week" instead of what it really means.
Nowhere in The Bible is any day of the week called "the LORD's Day." Not even the seventh day of God's inspired week, which He set aside [sanctified] on the seventh day of creation week for all of mankind to REMEMBER Him... and creation.
But there are plenty of biblical, prophetic references to the "LORD's Day"... most often called the "Day of the LORD."
"Blow ye the trumpet in Zion... let all the inhabitants of the land tremble: for THE DAY OF THE LORD cometh, for it is nigh at hand; a Day of darkness and of gloominess, a Day of clouds and of thick darkness..." (Joel 2:1-2 KJV).
"Woe unto you that desire THE DAY OF THE LORD! To what end is it for you? THE DAY OF THE LORD is darkness, and not light." (Amos 5:18)
"For THE DAY OF THE LORD of Hosts shall be upon every one that is proud and lofty..." (Isa.2:12).
There are over 30 direct prophetic references in the Bible for the coming "Day of the LORD": the prophesied Day when Jesus Christ returns to earth to fulfill the rest of the prophecies... of the Salvation of man and the restoration of the Kingdom of God to the earth that Satan and his angels perverted and destroyed way back in the beginning. And there are other abbreviated references to it that just say something like: "...and in that Day...".
But, the "LORD's Day" in which John found himself projected in his vision was not the day we call "Sunday" [and which God calls the "first day of the week" - see Matt.28:1]. John was "transported in vision" to the prophetic time JUST AHEAD OF US!
And what John saw was what we are seeing, today. And he saw prophecies that we are about to see fulfilled, soon. He saw the Great Tribulation that Jesus tells us will precede His return -- just before mankind under the guiding hand of Satan the Devil will bring all life on planet earth to the brink of extinction [see Matt.24:21-22].
He saw the horrors just ahead of us as the world approaches that prophesied time of utter global distress that will cause the nations to believe that total nuclear war is a viable way to wage war.
John saw Jesus' return with His angelic armies, to stop man from ending all life on earth:
"And I SAW HEAVEN OPENED, and lo, a white horse, and He who sat upon him was named 'Faithful and True'; and in Righteousness does He Judge and MAKE WAR... and His name is called, THE WORD OF GOD..." (Rev.19:11-14 MNT)
John saw Satan bound and unable to deceive the nations when Jesus returns... he saw Christ and His saints ruling the nations of the earth for a thousand years... and he saw the Last Great Day of God's plan of Salvation -- Judgment Day [read Rev.20].
And John saw beyond Judgment Day, into the future [see chapter 21-22] beyond God's present plan; when He will give the universe to His Children:
"...Behold, I AM making all things new... He who overcomes will inherit these, and I will be his God, and HE SHALL BE MY SON." (Rev.21:5-7 MNT)
These are a few of the things John saw in his vision, that he wrote down in the book of Revelation.
Answer :john saw what was going to happend in the future.he saw the time when the judgment day came
The author of Revelation is John of Patmos
John Revelator Blinded Patmos W Ian Is there any biblical proof or reference that John the Revelator was blinded at Patmos? According to the Bible, the apostle John was exiled to the island of Patmos, where he received the vision recorded in the book of Revelation. There is no mention in the Bible of John being blinded while on Patmos. In fact, the book of Revelation specifically states that John was given the vision "because he had been faithful" (Revelation 1:9). The book also says that John was told to "write on a scroll what you see and send it to the seven churches" (Revelation 1:11), which would not have been possible if he were blinded.
The Book of Revelation is signed by a person called John, who wrote from the island of Patmos. Conservative theologians insist that the author was the apostle John, while liberal theologians accept the different style and theology, and simply refer to him as John of Patmos.
There is no record of John of Patmos' age.
The book of Revelations was written by John on the island of Patmos roughly in the year 90.A.D.
Even if only allegorically, John speaks of the things he 'sees' in heaven, as if being able to see was normal and usual for him. There is no suggestion anywhere in the Book of Revelation that John of Patmos was blind.
The Book of Revelation, circa 95 AD, was written by John while on Patmos.
John was on the island of Patmos "Revelation 1:[9] I John, who also am your brother, and companion in tribulation, and in the kingdom and patience of Jesus Christ, was in the isle that is called Patmos, for the word of God, and for the testimony of Jesus Christ."
No. Christian tradition says that the Apostle John was exiled to Patmos. The Book of Revelation was signed by a person called John, who said that he was writing from Patmos. In the belief that this person must have been the apostle John, Christians began to wonder how and why John went to Patmos, and gradually developed the tradition that he had been exiled to the island.
He didn't write it It was written after his death.Answer:The New Testament doesn't provide the ages of any of the apostles at any point, so the answer to your question is unknowable from scripture.
Revelation