Brooks took this notion of paraphrase and developed it further in his classic "The Well Wrought Urn". The book is a polemic against the tendency for critics to reduce a poem to a single narrative or didactic message. He describes summative, reductionist reading of poetry with a phrase still popular today: "The Heresy of Paraphrase" (Leitch 2001). In fact, he argued poetry serves no didactic purpose because producing some kind of statement would be counter to a poem's purpose. Brooks argues "through irony, paradox, ambiguity and other rhetorical and poetic devices of his or her art, the poet works constantly to resist any reduction of the poem to a paraphrasable core, favoring the presentation of conflicting facets of theme and patterns of resolved stresses" (Leitch 2001).