Many have studied about Jesus and His kingdom and reckon it to be sufficient in and of itself to declare God's kingdom; but knowledge alone has not given man the ability to take dominion over the earth except that the Creator's life accompany it. Apart from Christ, the "land" is cursed.
Few have met their "woe is me, I am a man of unclean lips". Those without this humble encounter are making a lot of noise in the name of Christianity, but to the Isaiah's and Jobs of this age..., it is crystal clear that the "old man" still desires the old form of hierarchical temple worship, where God is kept in an Ark and man is determined that his own will be done on earth.
We're ambassadors of Christ, not delegates; there are huge differences in the appropriations and duties between the two. The Father has not delegated His work to us, He has called us to lose what we felt was a superior life to His. This surrender is His power through us and to the world.
Lest we lose our focus, His strength is made perfect in our weakness, not our own interpretation of how we should be going about His business.
"Therefore, my dear friends, as you have always obeyed—not only in my presence, but now much more in my absence—continue to work out your salvation with fear and trembling, for it is God who works in you to will and to act in order to fulfill his good purpose." (Philippians 2:12,13)