Kami Garcia and Margaret Stohl include a lot of literary references in their Beautiful Creatures series of books.  This poem by Charles Bukowski is quoted in the film based on the first book.

Lifedance

The area dividing the brain and the soul
is affected in many ways by
experience —
some lose all mind and become soul:
insane.
some lose all soul and become mind:
intellectual.
some lose both and become:
accepted.