Arnold's work as a literary critic began with the 1853 "Preface to the Poems". In it, he attempted to explain his extreme act of self-censorship in excluding the dramatic poem "Empedocles on Etna". With its emphasis on the importance of subject in poetry, on "clearness of arrangement, rigor of development, simplicity of style" learned from the Greeks, and in the strong imprint of Goethe and Wordsworth, may be observed nearly all the essential elements in his critical theory. George Watson described the preface, written by the thirty-one-year-old Arnold, as "oddly stiff and graceless when we think of the elegance of his later prose."