W.B. Yeats has thought and written much about the theory and practice of his own poetic art. For a full understanding of his poems, it is necessary to have some knowledge of his theory of poetry. He believed in the theory of "Art for art's sake" during the early stage of his poetic career. But actually, his genius was lyrical. It penetrated his essentially lyrical dreams. In the 1919s in his early career, he became the advocate of "art for art's sake". He began writing "pure poetry" under the influence of the French symbolists and the English Aesthetes. He divested such poetry of all the exterior decorations.
