eat it or read it

From the book review of SUPER-INFINITE: The Transformations of John Donne, by Katherine Rundell:

Rundell’s own style can dazzle, though at times the wit feels a bit strained, as when she describes Donne’s unreadable tract “Pseudo-Martyr” as “so dense it would be swifter to eat it than to read it."

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I can think of a poem or two that one might say was "so dense it would be swifter to eat it than to read it."