The Monomyth
The Teaching
A hero ventures forth from the world of common day into a region of supernatural wonder: fabulous forces are there encountered and a decisive victory is won: the hero comes back from this mysterious adventure with the power to bestow boons on his fellow man.
The standard path of the mythological adventure of the hero is a magnification of the formula represented in the rites of passage: separation, initiation, return — which might be named the nuclear unit of the monomyth.
Commentary
Joseph Campbell spent thirty years reading the world's mythologies in their original languages and looking for what they had in common. What he found was not the surface details, which differ wildly, but the underlying structure, which was strikingly consistent. The same narrative shape recurs across cultures separated by thousands of years and tens of thousands of miles. He called the shape the monomyth.
The hero is called out of the ordinary world. The call is refused. The call returns. The hero crosses a threshold into a region of trial and transformation. Helpers and adversaries appear. The hero descends into the deepest place, often a literal underworld or its symbolic equivalent, and meets the thing that cannot be evaded. Something dies. Something is gained. The hero begins the return journey, often reluctantly, and brings back what was gained as a gift for the community.
Campbell's claim was not literary but anthropological. The monomyth is consistent across cultures because it encodes the universal recognition that the philosophical traditions state in doctrine. The traditions describe the same transformation. The myths describe it in story so that it can be inhabited rather than only understood. This is the same curriculum the traditions trace at the individual scale. The hero's journey is the perennial path in narrative form. The body politic that loses access to its living mythology is a civilization that no longer remembers how to tell anyone what the journey looks like.