Sadly not to everyone. Many who parrot it off have never taken the time to understand what the words mean.
I used to think that too until I did some further study.
The Kingdom, Jesus said was to
"come" so that God's will could
"be done on earth as it is in heaven". So the kingdom had to be a pretty powerful force to bring that about. Looking at other scriptures to ascertain
what the Kingdom was exactly, I studied the prophesies in Daniel for quite a while. Have you done so? Daniel's prophesies, God said were to be sealed up till "the time of the end". (our time) when knowledge was to become abundant. (Daniel 12:4: 9-10)
In Daniel ch 2 King Nebuchadnezzar had a dream about an immense image with different body parts made of different metals. It began with a head of gold and progressed through lesser metals such as silver, copper, iron until it reached feet, partly of iron and partly of clay. Partly strong but partly weak. Its strength is weakened by its democracy.
Then Daniel saw a huge stone cut out of a mountain but not with human hands (so nothing man made) and it struck the image on its feet and crushed the whole thing into dust. The dust was then blown away and the stone became a large mountain and filled the whole earth. It was a pretty impressive dream and one that only Daniel could interpret because it was from God.
What Daniel revealed stretches all the way from his time, to our day. Each of the parts of the image represented world powers who have had dealings with God's people down through history, beginning with Babylon and foretelling the next world power to be Medo-Persia, then Greece, then Rome and finally Britain who became allied with the USA in these "last days". These final "kings" are represented by the feet of clay. There are no others before the stone is unleashed to do its destructive work. It all happened exactly as foretold.
Daniel then says......
" In the days of those kings [the last ones] the God of heaven will set up a kingdom which will never be destroyed, and that kingdom will not be left for another people; it will crush and put an end to all these kingdoms, but it will itself endure forever." (Daniel 2:44 NASB)
Who was Jesus speaking to when he said that
"the Kingdom of God is within you"? (Luke 17:21) He was speaking to the Pharisees of whom God said
"this people honors me with their lips but their heart is far removed from me". (Matthew 15:8) So there is no way that the Kingdom was within those wicked hearts. According to Daniel, this Kingdom was going to "come" in a very powerful way to crush human kingdoms out of existence and replace them...but not until our time.
On further investigation, I discovered that other translations read...
"nor will they say, ‘Look, here it is!’ or, ‘There it is!’ For behold, the kingdom of God is in your midst.”
So to align with Daniel's prophesy, the Kingdom was not something "inside" those wicked, scheming Pharisees, but inside their nation, as God had promised. There was the King of God's Kingdom walking amongst them....and they failed to recognize him.