And he said to them, “Truly, I say to you, there are some standing here who will not taste death until they see the kingdom of God after it has come with power.”
This verse makes absolutely no sense if one reads it and thinks it means some future coming of the kingdom of God. Yet it makes perfect sense when we look at that day so many years ago when the Holy Spirit came with powerful tongues of fire on the Day of Pentecost after the risen Lord Jesus returned to Heaven. After that day the people of God have lived lives of powerful transformation by the power of God. The book of Acts testifies to this.
I think that this focus of the kingdom of God coming with power changed when Constantine issued the Edict of Milan in 313 and institutionalized Christianity. Since then it seems that the faith has been more about church power than the kingdom coming with power. Yet many still pray for God's kingdom to come on earth as it is in heaven because the gospel is not about earthly sacraments but about heavenly power coming and filling earthly vessels.
Yours Lord is the kingdom and the power and the glory. Forever.