This raises the frequently asked question: Did Jesus really mean "within you"? Or did He mean "among you"? Whichever one of these options Jesus meant—or even both of them—does not negate the facts that:
» The Kingdom of God certainly did reside in the Person of the human Jesus Christ.
» God's Kingdom certainly does reside today in His brothers and sisters—the members of His church—by the indwelling of His Holy Spirit.
» The fullness of God's Kingdom must come, completely, at "the fullness of times," which will be at some time in the future: ". . . that in the dispensation of the fullness of the times He might gather together in one all things in Christ, both which are in heaven and which are on earth—in Him" (Ephesians 1:10).
We know that the Kingdom of God was inherent within the human Jesus; and therefore, if we are now in Him by His Spirit dwelling in us, then the Kingdom is inherent within us too.
Actually, the "within you or among you" argument is something of a moot point. Why? Because God's Kingdom certainly did not originate with the conception or birth of the human Jesus. Rather, it was actually originated and prepared millennia prior to Jesus' human lifetime. As the Logos, He and God the Father began preparing their Kingdom way back in prehistory, at the time God's Word calls "the foundation of the world."
Jesus says in Matthew 25:34: "Then the King [Jesus Christ] will say to those on His right hand, 'Come, you blessed of My Father, inherit the kingdom prepared for you from the foundation of the world." Hebrews 4:3 also shows that God's Kingdom was planned "from the foundation of the world": "For we who have believed do enter that rest, as He has said: 'So I swore in My wrath, "They shall not enter My rest,"' although the works were finished from the foundation of the world."
God the Father and Jesus had completed the major part of their preparation work for their Kingdom eons ago!
Thy Kingdom Come! (Part One)