interior or exterior God? roots of Priestdom? all you can eat holiness?

Topics arising in the course of Monday morning men's Bible study 6/3/2013.

interior or exterior God?
Leo Tolstoy's title, "The Kingdom of God is Within You," makes the case that the Lord's Prayer refers to "...Thy kingdom come, Thy will be done, on earth as in heaven" and the true meaning lies in one's building a kingdom in one's own heart; a heart of gratitude, glorifying (but also vigilance) and service. Where then is the split between expending one life on the visible world and on the interior world; knowing there is a link between what is in one's heart and the deeds one does.

roots of Priestdom?
Surely the 1st and 2nd Temples on the Temple Mount had keepers of the Holy of Holies (the inner sanctum) and their job was to intercede on behalf of ordinary believers. And the tribe of Levi had the job of caring for the Arc and sacrifices in the wandering days. There is a path that goes from Temple Judaism to synagogue Judaism and from Rabbi Jesus' "house churches" (ecclesia; primitive Christianity) to the administrative machinery of the Roman Empire under Constantine I. But exactly at what point did the flat "organizational tree" go to Religious Specialists who would intercede for ordinary persons?

"all you can eat" holiness?
For a mortal mind how much holiness can a person take at one time? Thinking of an analogy of "unlimited talk time" (cell phone service plan), or "unlimited bandwidth" (Internet plan), how does one's outlook change when there is no scarcity. Perhaps it is like the full-time resident of a tourist destination who feels content with the *potential* to visit all the events and cultural assets of the fair city, but in practice only does so when entertaining out of town guests. Maybe explaining or describing or articulating one's relgious path and interior life also depends on an interlocutor who is "not from around here;" someone whose knowledge/familiarity can't be taken for granted and must be spoken about step by step. Just so of one's appetite for holiness: there is only so much one's senses can fill up on, and when it surrounds you there is less rarity and less urgency to seek for it.