"The same heroic plot can yield 

both good and bad poems" (Tolkein 17). 

Plot is not enough to make a poem (or any work of literature for that matter).
Students misunderstand literature when they read Sparknotes.
The structure of the language matters just as much as (if not more than) the structure of the events.

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Tolkein, J. R. R. The Monsters and the Critics, and Other Essays. Harper Collins, 2007.