…I am not of this world– John 8:23 (NASB)
…My kingdom is not of this world.- Joh 18:36 (NASB)
Let’s just settle this from the onset, the get-go or simply the start. Jesus spoke of Himself and His kingdom not being of this world. I know that many in Christian circles have expressed such views through bumper stickers and t-shirts as well as anything it can possibly be printed upon nowadays. (That’s just part of our ways that we don’t seem ready to part with any time soon.) What we learn is that the Lord shared this is some specific situations so we can be clear about what we are expressing.
And He was saying to them, ” You are from below, I am from above; you are of this world, I am not of this world.- John 8:23 (NASB). This is not easy to understand out of its context. in verse 21,it is stated: Then He said again to them, “I go away, and you will seek Me, and will die in your sin; where I am going, you cannot come.” Some of the Jews talked among themselves, assuming to understand what He meant. He simply clarified things for their own understanding. Their earthly ways could not comprehend His eternal means and methods. He is from above. They could not possibly understand such matters, being concerned with the things below and not above.
Jesus answered, “My kingdom is not of this world. If My kingdom were of this world, then My servants would be fighting so that I would not be handed over to the Jews; but as it is, My kingdom is not of this realm.”- John 18:36(NASB). Again, I say, the context helps us to understand this. Jesus is answering Pilate’s inquiry of Him. The Jews sought him to be punished by Pilate. Pilate wanted to hear from Jesus. Jesus simply shared the truth. He did not plead for mercy or fight to prove His own innocence. he addressed Pilate by sharing that He indeed had a kingdom that was not of this world.
What may not have been understood stands out for us today. We catch on. We see it. The kingdom is not of this world because our King is not of this world. We must be in this world because we live on earth, but our kingdom citizenry should prevail within us as we seek to influence and inspire the world around us. Being unworldly is not an option. We are not to become worldly, but we are to serve as the catalyst for change.
Revbruce's Blog 
[…] We talked about the church working from the “inside out.” We consider it the outward working of the church that starts with an internal spark like a combustible engines. You start discipling and developing people. Then, after that, you look at disseminating the Word and demonstrating the Word. All of this is done with a kingdom mindset that is not of this world. […]