THE KINGDOM
This will be a little more academic than usual and I am using material from The Reformation Study Bible (p. 1489), Systematic Theology by Berkhof (p. 569-70) and the Reformed Reader.
The theme of the Kingdom of God runs through both the Old and New Testaments, focusing on God’s purpose for this world. God has declared that He would exercise His kingship (Dan. 4:34-35) by ruling over His chosen people through His chosen King (Jesus - Is. 9:6-7). Jesus is ruler over all (Matt. 28:18; Col 1:13), King of kings and Lord of lords (Re. 17:14; 19:16). The kingdom is present in its beginning but future in it fullness; in one sense it is here already, but in the richest sense still to come (Luke 11:20; 16:16; 17:12; 22:16-30).
The kingdom came bring mercy and judgment (Matt. 3:1-2). Those who repented and believe would find mercy, those who did not would find judgment. The task of the church is to make this kingdom visible in our action and words. How the rule of God is established and demonstrated in our lives, along with the powerful regenerative influence or the Holy Spirit, will help this be realized on earth in an imperfect form. Jesus taught the present spiritual realization and the universal character of the Kingdom; while at the same time holding out to the future the perfect blessings of salvation yet to be realized. It is in heaven that the believers will understand the fullness of the Kingdom of God.
The Kingdom of God is not to be found in an organization, but is to be demonstrated by those in whom the Holy Spirit dwells. This does not mean that the organized church has no responsibility in the Kingdom here on earth, but it points to the necessity of groups of believers applying these principles of the Kingdom to every domain of life. This interaction with humanity necessitates the Kingdom being imperfect in form until the return of Christ. The parables of the Wheat and Tares and the Fishnet show the imperfections in the visible church. The Kingdom may be said to be a broader concept than the Church, because it aims at nothing less than the complete control of the areas of life. It represents the domain of God in every sphere of human endeavor.
For a short review of the Kingdom read:
http://beginningwithmoses.org/bt-articles/232/the-kingdom-of-god
For those of you a little more serious about things Jonathan Edwards has some great material at:
http://www.biblebb.com/files/edwards/JE-pressing.htm
This selection is from the Reformed Reader:
What is the Kingdom of God? The idea is so pervasive in Scripture that it is very difficult to be comprehensive. There is much that can be said in trying to give a definition. It must be asserted that the kingdom of God is not a place—though we usually think of kingdoms in geographic terms. It is better understood in terms of the dynamic reign of God. Geerhardus Vos identified three strands which he called its essence: (1) the supremacy of God in the sphere of saving power; (2) the sphere of righteousness; and (3) the state of blessedness. Paul says, "The kingdom of God is . . . in power" (1 Cor. 4:20). The sermon on the mount is, in many ways, an explication of the nature of the righteousness of the kingdom, evident even in the blessedness promised in the beatitudes. The kingdom of God is the sphere in which he reigns—that is—the place where his sovereignty and dominion express themselves. When the Pharisees came to him and asked him when the kingdom was to come, Jesus could tell his hearers, that the Kingdom of God was in their midst. Imagine how confused they must have been when he said "The kingdom of God does not come with observation; nor will they say, ‘See here!’ or ‘See there!’ For indeed, the Kingdom of God is in your midst." It was present in the ministry of Jesus—his teaching, his acts of compassion, his miracles. Isn’t this what Jesus was intending when, after his temptations in the wilderness, he sat in the synagogue in Nazareth and read on the Sabbath Day from Isaiah the prophet: "18 The Spirit of the Lord is upon me, because he has anointed me to preach the gospel to the poor; he has sent me to heal the brokenhearted, to preach liberty to the captives, and recovery of sight to the blind, to set at liberty those who are oppressed, 19 To preach the acceptable year of the Lord." Luke 4:18&19? These are the acts of the reign of God—proof that he had come on a divine mission—that he was the unique son, who fulfills the words of Scripture. The Pharisees were confused, because they did not expect this kind of kingdom.