According to Luke 17:21, the Kingdom of God is within the believer. He has given unto us the keys to the kingdom. It is only a matter of the believer activating it. The Kingdom of God comes with power in Mark 9:1. It is the supernatural power of God at work in us to carry out our God-given assignment in the earth. It is not in word only, it is in demonstration. In otherwords, demonstrating what you preach and teach equals to the Kingdom of God. Jesus is not coming back to repeat His works (kingdom) in the earth. He passed the torch on to the believer, thereby setting the example for all to follow. And in that, He proclaimed even greater works than He, we shall do. Jesus himself sent the disciples out to preach the kingdom of God, and to heal the sick (Luke 9:2). Word and then demonstration. Repeat that. Word and then demonstration. If I cast out devils by the Spirit of God, then the kingdom of God is come unto you. If I speak to these devils (strongholds in people lives) and allow God to use me to bring deliverance, then the kingdom of God has come unto them through me. Don't be as the Pharisees who shut up the kingdom in people's face due to being bound to a religious belief system originated from some human agency. Paul says in I Corinthians 2:4, and by the way Paul is a perfect example of operating in kingdom and so is the Early Church in the Book of Acts. That's why it's called The Book of Acts because they demonstrated how the church is supposed to operate today. But somehow their way which is God's way, got swepted under the pulpit carpet of traditions. Paul said, "And my speech and my preaching was not with enticing words of man's wisdom, but in demonstration of the Spirit and of power, that your faith should not stand in the wisdom of men, but in the power of God.
Kingdom is: