This comes to mind:
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.
(Luk 17:20-21 KJV)
The difference between an observer and a participant. But the lines have become very blurred. Many now consider participation to be the observance of something. It's like people going to a football game have participated in the game just by being a cheering crowd. Or a cheer leader. But the kingdom is getting in the game, in the race.