One could bear the mark of circumcision that was the sign of the old covenant but still not be a Jew. The real Jews were those whose hearts were circumcised, which means surrendered to God’s will.
God’s purpose was revealed in both the old covenant and new covenant. In the old covenant the mysteries of the kingdom of God were concealed; in the new covenant they are more fully revealed. And more mysteries will be revealed in the final judgment and new Creation. All of this is part of the metanarrative of redemption being sovereignly executed.
Jesus’ first advent was pivotal from the old covenant to the new. He came declaring the good news of the kingdom of God. And part of this good news was his promise to build his ekklesia (church) (Matthew 16:18). This promise is being fulfilled currently through his disciples. Apparently, this work will continue until his second advent. But it does raise a question: How does the kingdom of God connect to Jesus’ promise to build his ekklesia?
Perhaps a way to connect the two is to view the new covenant ekklesia as a vehicle of the kingdom. The new testament ekklesia is being built through the supernatural work of the Holy Spirit who regenerates and indwells the people of God who are to serve as agents of the kingdom of God. As his agents, every disciple of Jesus should live a Christian lifestyle surrendered to the will and ways of God. In this way, the kingdom of God grows as the body of Christ (the New Covenant ekklesia) grows.
Justification and the gift of the Holy Spirit are the blessings of the kingdom of God bestowed on the disciples of Jesus. These blessings include forgiveness of sins through regeneration and the power to obey the Creation Mandate. Consequently, the kingdom of God connects the two primary mandates—the Creation Mandate (Genesis 1:26−28) and the Discipleship Mandate (Matthew 28:18−20).
Historically, there are various eschatological views of the future kingdom of God in the metanarrative. The more common ones are amillennialism, postmillennialism, old premillennialism, and new premillennialism.
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Amillennialism was the early view of the church father Origen, who allegorized the millennium.
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Postmillennialism was popular early in the eighteenth century Great Awakening. This view posited that the new covenant ekklesia would inaugurate the millennium and the second advent of Jesus would come afterward.
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Old premillennialism was adopted later in the eighteenth century due to disappointment with the Great Awakening. This view posits that the Old Testament promises made to Israel will be fulfilled through the new covenant ekklesia, which includes people from all ethnicities. And the second advent would precede the millennium.
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New premillennialism developed in the nineteenth century as part of dispensationalism. This view posits that the Old Testament promises made to Israel will be fulfilled through ethnic Israel. To accomplish this, the new covenant ekklesia will be raptured prior to the second advent of Christ. And the second advent would come before the millennium.
All these views are equivocal and there are still advocates for each of them. Whenever the end of time might be, we can be assured that the kingdom of God will finally be fully realized in all its aspects. The not yet will be now. The internal and external, and the physical and spiritual will be congruent. The concealed will be fully revealed. And the unfulfilled will be fulfilled. This is God’s sovereign plan and purpose that will be accomplished according to his will, ways, and timing, and all for his glory.
But one thing should be clear to all disciples of Jesus: we should be in awe of him and unified in heart and mind to serve him unequivocally.