Seeing the Kingdom

The Kingdom of God, which is the main subject of the Gospel (see here and here for more), is not a far future thing. If you are reigned over by the Messiah Jesus from his throne in Heaven, then you are a citizen of that Kingdom now. Yes, there is a time still future when every knee will bow whether they accept his reign or not, but his reign as High King of the Universe exists in the present.

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Some Pharisees asked Jesus when the kingdom of God would come. 

Jesus: The kingdom of God comes—but not with signs that you can observe. People are not going to say, “Look! Here it is!” They’re not going to say, “Look! It’s over there!” You want to see the kingdom of God? The kingdom of God is already here among you.  (Luke 17.20-21, Voice)

He says, “Do not ask about the times in which the season of the kingdom of heaven will again arise and come. Rather, be eager that you may be found worthy of it. It is within you. That is, it depends on your own wills and is in your own power, whether or not you receive it. Everyone that has attained to justification by means of faith in Christ and decorated by every virtue is counted worthy of the kingdom of heaven."

Cyril of Alexandria (AD 375-444)
Commentary on Luke, Homily 117.

If the devil has been driven out and sin no longer reigns, then the kingdom of God is established in us... St. Paul described the nature of this kingdom in this way: “For the kingdom of God is not food and drink, but righteousness and peace and joy in the Holy Spirit.” If the kingdom of God is within us and is righteousness, peace and joy, then someone that remains in these is surely within the kingdom of God. Someone that remains in unrighteousness, conflict and the melancholy that kills the life of the spirit is already a citizen of the devil’s kingdom, of hell and of death. These are the signs whether it is God’s kingdom or the devil’s.

John Cassian  (AD 360-435)
Conference 1.13.