“And when He was demanded of the Pharisees, when the kingdom of God should come, He answered them and said, ‘The kingdom of God cometh not with observation: neither shall they say, ‘Lo here!’ or, ‘Lo there!’ for, behold, the kingdom of God is within you.’ ” Luke 17:20-21 (KJB)
Please note who is asking this of Jesus. The Pharisees, a sect of religious leaders who did not even see the signs of the coming of the Messiah. The one’s who should have not missed the obvious.
They were more concerned with rituals, and religious observances, etc. than they were with the presence of God, or the kingdom of God.
To their question Jesus answers. His answer is probably not what the Pharisees wanted to hear. He is basically telling them, “It is here, near you, and you are missing it”. They missed all the Scriptural signs of Jesus’s birth. They are missing the signs they have actually heard and seen Him do.
The kingdom of God is not announced like a business advertisement. It is not brought in by demonstration and fanfare. God is present all around; within His people, and within creation. It is revealed in the person of Jesus Christ.
If you refuse and reject Jesus Christ for who He is you miss the kingdom of God. He died on the cross for our sins, was buried, and He rose from that grave and forever lives within the hearts and lives of those who love Him, and is seated at the right hand of the Father.