"the kingdom of God is among you" (part 2)

Continuing an essay about four common misconceptions about the kingdom Jesus announced...

2. We are partners with God in the hard work of "building the kingdom of God." Again, I'm not exactly sure where this concept came from. Harkness even points out that the language of "building the kingdom" is unbiblical, but she still seems to emphasize our "efforts" and "working" and "struggle to create a new and divine order." And these ideas also seem very apparent in the Christian social justice movement. But I hear Jesus proclaiming the good news that the kingdom is God's gift to us. In the startling announcement of Jesus that "The time is fulfilled, and the kingdom of God is at hand," and also in its final complete revelation, God's kingdom is clearly God's work, given to us. The writer of Revelation even uses the image of the kingdom of God as a city coming down from heaven (Rev 21). Whether we accept this prophecy as literal or figurative, the message seems clear: The future, full realization of God's kingdom will also be a gift from God. Not human work at all, but God's work, given to us:
[As the city was coming down] He who sat upon the throne said, "Behold, I make all things new."

...And he said to me, "It is done! I am the Alpha and the Omega, the beginning and the end. To the thirsty I will give from the fountain of the water of life without payment." (Rev 21.5-6, my italics)
Relentless human effort, political struggle, and the burden of responsibility (for "building the kingdom") is very obvious in Christian activism. Overwhelming workloads and burn-out are common. Is this what Jesus called us to? Is this the good news of the kingdom of God, that we must work and struggle for years (centuries?) to build it? Compared to this, Jesus' actual words sound like incredibly good news:
"Come to me, all who labor and are heavy laden, and I will give you rest. Take my yoke upon you, and learn from me; for I am gentle and lowly in heart, and you will find rest for your souls. For my yoke is easy, and my burden is light." (Mt 11.28-30)
God's kingdom isn't built by our efforts or through our struggling. It's offered to us now if we will receive it as God's work, God's gift, for God's glory. As Jesus said, "Truly, I say to you, whoever does not receive the kingdom of God like a child shall not enter it." (Mk 10.15)