The document discusses Samuel Taylor Coleridge's 'Biographia Literaria,' which critiques and expands on William Wordsworth's theories of poetry, particularly regarding language and meter. Coleridge argues against Wordsworth's idea of poetry using the language of rustic people and emphasizes the essential difference between poetry and prose, asserting that meter is integral to poetry's expression and emotional impact. The text also explores the relationship between poetic imagination, the selection of language, and the role of meter in enhancing the liveliness and excitement of poetic works.