Throughout the Hebrew scriptures there was a dual concept of the kingdom of heaven. The prophets presented the kingdom of God as:
1. A present reality; and as
2. A future hope--when the kingdom would be realized in fullness upon the appearance of the Messiah. This is the kingdom concept which John the Baptist taught.
From the very first Jesus and the apostles taught both of these concepts. There were two other ideas of the kingdom which should be borne in mind:
3. The later Jewish concept of a world-wide and transcendental kingdom of supernatural origin and miraculous inauguration.
4. The Persian teachings portraying the establishment of a divine kingdom as the achievement of the triumph of good over evil at the end of the world.
Just before the advent of Jesus on earth, the Jews combined and confused all of these ideas of the kingdom into their apocalyptic concept of the Messiah's coming to establish the age of the Jewish triumph, the eternal age of God's supreme rule on earth, the new world, the era in which all mankind would worship Yahweh. In choosing to utilize this concept of the kingdom of heaven, Jesus elected to appropriate the most vital and culminating heritage of both the Jewish and Persian religions.
The kingdom of heaven, as it has been understood and misunderstood down through the centuries of the Christian era, embraced four distinct groups of ideas:
1. The concept of the Jews.
2. The concept of the Persians.
3. The personal-experience concept of Jesus--"the kingdom of heaven within you."
4. The composite and confused concepts which the founders and promulgators of Christianity have sought to impress upon the world.
At different times and in varying circumstances it appears that Jesus may have presented numerous concepts of the "kingdom" in his public teachings, but to his apostles he always taught the kingdom as embracing man's personal experience in relation to his fellows on earth and to the Father in heaven. Concerning the kingdom, his last word always was, "The kingdom is within you."
Centuries of confusion regarding the meaning of the term "kingdom of heaven" have been due to three factors:
1. The confusion occasioned by observing the idea of the "kingdom" as it passed through the various progressive phases of its recasting by Jesus and his apostles.
2. The confusion which was inevitably associated with the transplantation of early Christianity from a Jewish to a gentile soil.
3. The confusion which was inherent in the fact that Christianity became a religion which was organized about the central idea of Jesus' person; the gospel of the kingdom became more and more a religion about him, instead of the religion Jesus taught.

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