Below is taken from but modified by me from Watcham Nee's Book, "The Normal Christian Life". I highly recommend this book to all.
From scripture we can know the kingdom of God is not this world. The world God has planned for us since the beginning of time is headed up by His Son Jesus Christ:
16 For in him all things were created: things in heaven and on earth, visible and invisible, whether thrones or powers or rulers or authorities; all things have been created through him and for him. 17 He is before all things, and in him all things hold together.
Satan, working through man's flesh, has set up a rival kingdom known in Scripture as "this world". He has in FACT become the prince of this world.
31 Now is the time for judgment on this world; now the prince of this world will be driven out.
Thus in Satan's hands, the first creation has become the OLD CREATION, and God's primary concern is now no longer with the old but with a second or the NEW CREATION. KNOW THIS, God is bringing in a new creation, a new kingdom, and a new world, and NOTHING of the OLD CREATION, the old kingdom, or the old world can be transferred to the NEW.
It is question now of these two rival realms, and WHICH REALM WE BELONG TO.
The apostle Paul, of course, leaves us in NO DOUBT as to which of these two realms is now in FACT ours who put their trust in Jesus Christ. He tells us that God, in redemption, He:
12 and giving joyful thanks to the Father, who has qualified you to share in the inheritance of his holy people in the kingdom of light. 13 For he has rescued us from the dominion of darkness and brought us into the kingdom of the Son he loves, 14 in whom we have redemption, the forgiveness of sins.
Hence, our CITIZENSHIP HENCEFORTH IS THERE.
But in order to bring us into His new kingdom, God must do something NEW in us. HE MUST MAKE US NEW CREATURES. UNLESS WE ARE CREATED ANEW WE CAN NEVER FIT INTO THE NEW CREATION OF GOD. (John 3:6, 1 Cor. 15:50)
6 Flesh gives birth to flesh, but the Spirit gives birth to spirit.
1 Corinthians 15:50
50 I declare to you, brothers and sisters, that flesh and blood cannot inherit the kingdom of God, nor does the perishable inherit the imperishable.
However EDUCATED, however CULTURED, however IMPROVED it be, flesh is still FLESH. Our fitness for the NEW KINGDOM is determined by the CREATION to which we belong to. Do we belong to the OLD CREATION or the NEW? ARE WE BORN OF THE flesh or of the Spirit? Our ultimate suitability for the NEW REALM hinges on the question of origin. The question IS NOT "good or bad?" but "flesh or Spirit?" "That which is born of the flesh is flesh," and WILL NEVER BE ANYTHING ELSE. That which is of the old creation can NEVER pass over into the new. The old creation can never inherit the kingdom of God.
Now how do we become a new creature that is able to pass over into the NEW CREATION God is preparing for us? By believing God's plan. He had purpose by the CROSS of Christ to do away with our old creation (sinful nature) and by His resurrection provide a new life for us:
2 Corinthians 5:17
17 Therefore, if anyone is in Christ, the new creation has come: The old has gone, the new is here!
The CROSS was the means God used to BRING TO AN END "the old things" by setting aside altogether our "old man (sin nature)" and the resurrection was the means He employed to impart to us all that is necessary for our life in the NEW WORLD.
We have two worlds before us, the OLD and the NEW. You may be a good person in the old creation, but as long as YOU BELONG to the OLD you are under the SENTENCE OF DEATH, because nothing of the old can be carried into the NEW
(1 Corinthians 15:50- SEE ABOVE).
THE CROSS is the means of ESCAPE from that OLD creation. God gathered up in the Person of His Son all that was of Adam and crucified Him, so in Him all that was of Adam was done away with.
20 I have been crucified with Christ and I no longer live, but Christ lives in me. The life I now live in the body, I live by faith in the Son of God, who loved me and gave himself for me.
1 Corinthians 1:18
[ Christ Crucified Is God’s Power and Wisdom ] For the message of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God.
The CROSS is the dividing line to remain OLD or become NEW. May you choose to enter God's Kingdom by trusting in God's Son. He is the way, the truth, and the life.
God loves you and so do I!