Now when He was asked by the Pharisees when the kingdom of God would come, He answered them and 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 within you.” (Luke 17:20-21 NKJV)
It seems to be a rather common view among Christians, especially among evangelical and fundamentalist Christians, that when a person “accepts Christ as his personal Saviour,” then the Kingdom of God resides in his heart and mind.
Notice that Jesus said these words to the PHARISEES who did not accept Jesus as their Messiah, but believed Him to be an imposter. Surely the Kingdom was not within them in the sense of being in their hearts and minds.
So what DID Jesus mean when he told the Pharisees that the kingdom of God was within them? A kingdom consists of a king and his subjects. Right there, within that group of Pharisees, right in their midst, was the Kingdom of God! The King of that Kingdom was Jesus, and his disciples were his subjects. The Kingdom had come! (in its infant stage). It did not come with signs to be observed, but was right there in their midst, though they did not recognize it.