The Kingdom of God exists wherever someone submits himself/herself to God as King. John the Baptist (Matthew 3:2) (and later Jesus – Matthew 4:17) said that the Kingdom is “at hand” (close enough to reach out and take hold of), therefore repent (change your mind) – there is no way to submit to anyone’s authority when you think you are the center of the Universe. Paul said the “Kingdom of God is… righteousness, peace and joy in the Holy Spirit.” (Romans 14:17) The Holy Spirit brings righteousness, peace and joy when you submit to God as King and allow His Spirit to dwell within you.
Is this an instant transformation? Rarely. God knows the work that lasts is the work that doesn’t happen overnight. Why? We know God is love (1 John 4:8) and love is patient and kind (1 Cor 13:4) – He will not force himself upon you like a king that just overthrew your former king and now demands your loyalty. No! God wants you to want to submit to Him. He wants you to choose His Will over yours. He doesn’t say “Don’t eat the fruit of that tree” (Genesis 2:16-17) because He is holding something back, He wants you to trust Him and obey Him even when there is an option not to.