One often missed part of the Hero's Journey (Monomyth) is the stage of the Book of Law. As the Hero enters the Outer Cave, an Authoritarian Figure makes explicit the rules of this world / phase of the Journey / Transformation.
In The Godfather (1972), Michael is warned that no-one has killed a cop before. It's never been done before. The Family would lose all it's connections.
In Star Wars (1977), the Inn-Keeper tells Luke that the droids are not welcome. They remain outside.
In Silence of the Lambs (1991), Lecter tells Clarice what the rules of the game are. Clarice agrees to play along to get the necessary information from him.
This Authoritarian Figure is separate and distinct from the Threshold Guardian; the Hero must pass both (a measure of his suitability for the adventure).
-------------------------------------------------------------------------
LEARN MORE AT: http://www.clickok.co.uk/index4.html
-------------------------------------------------------------------------