Wordsworth outlines three principles in the preface to the Lyrical Ballads: 1) the poetry concerns nature and country life, 2) it emphasizes poetry as an art form to enlighten readers on human emotion, and 3) clean, simple lines best capture the imagination rather than overly complicated styles. He chose rustic subjects and language to find a "plainer and more emphatic" way to communicate passions. Poetry combines feeling and thought as a spontaneous overflow of powerful emotions and ideas. The poet's duty is to produce pleasure and enlarge human capability. Wordsworth defends his choice of common subjects and language to better understand essential human passions.