Jesus said it, at that point we are in agreement.
Let us see the whole context and raise Rev 3:21 and show the verse from the 14th
Revelation 3:14-21 New International Version (NIV)
“To the angel of the church in Laodicea write:
These are the words of the Amen, the faithful and true witness, the ruler of God’s creation. I know your deeds, that you are neither cold nor hot. I wish you were either one or the other! So, because you are lukewarm—neither hot nor cold—I am about to spit you out of my mouth. You say, ‘I am rich; I have acquired wealth and do not need a thing.’ But you do not realize that you are wretched, pitiful, poor, blind and naked. I counsel you to buy from me gold refined in the fire, so you can become rich; and white clothes to wear, so you can cover your shameful nakedness; and salve to put on your eyes, so you can see.
Those whom I love I rebuke and discipline. So be earnest and repent. Here I am! I stand at the door and knock. If anyone hears my voice and opens the door, I will come in and eat with that person, and they with me.
To the one who is victorious, I will give the right to sit with me on my throne,
just as I was victorious and sat down with my Father on his throne.
Now how would one be victorious?
As the Lord Jesus was victorious?
Is it to embark in a conquest and invade everybody?
No.
The Bible answers how to be victorious.
1 John 5:1-4 New International Version (NIV)
Everyone who believes that Jesus is the Christ is born of God, and everyone who loves the father loves his child as well. This is how we know that we love the children of God:
by loving God and carrying out his commands. In fact, this is love for God: to keep his commands. And his commands are not burdensome, for everyone born of God overcomes the world.
This is the victory that has overcome the world, even our faith.
This is a separate thought from Rev 6:2 - the first seal.
Revelation 6:2 New International Version (NIV)
I looked, and there before me was a white horse! Its rider held a bow, and he was given a crown, and he rode out as a conqueror bent on conquest.
This was fulfilled in History:
In 380 CE, the emperor Theodosius issued the Edict of Thessalonica, which made Christianity, specifically Nicene Christianity, the official religion of the Roman Empire. Most other Christian sects were deemed heretical, lost their legal status, and had their properties confiscated by the Roman state.
When was the prophecy written? before 100 AD
When was the prophecy fulfilled? 380 CE
What represented the white horse? Nicene Christianity
What represented the bow? the Edict of Thessalonica, under the penalty of death or confiscation
What represented the crown? emperor Theodosius
How are we sure that "and he rode out as a conqueror bent on conquest." pertains to this part of history?
Please watch the video how Nicene Christianity spread