This seminar paper provides a comparative philosophical analysis of W.B. Yeats’s poetry, focusing on the convergence of Mysticism, Platonism, and Sufi thought in his later works. Yeats, a poet deeply invested in the spiritual and the occult, sought a unified vision of existence that transcended the material world. This study examines how Yeats’s preoccupation with the Platonic "World of Ideas" and the cyclical nature of history (his theory of the Gyres) resonates with the mystical traditions of both the West and the East. A unique feature of this research is the exploration of Sufi influences, particularly the concepts of divine love and the union of the soul with the Absolute, as reflected in poems like "Sailing to Byzantium" and "The Delphic Oracle Upon Plotinus." The paper argues that Yeats’s poetic journey was an attempt to bridge the gap between the intellect and the spirit, utilizing the symbolic language of Sufism and Neoplatonism to articulate the "Anima Mundi" or the World Soul. By analyzing his use of symbols like the tower, the swan, and the golden bird, the research illustrates how Yeats transformed complex metaphysical doctrines into visceral poetic experiences. The study concludes that Yeats’s enduring legacy lies in his ability to create a "universal religion of art," where Platonism and Sufism meet to offer a profound critique of modern secularism and a celebration of the immortal human spirit.

Keywords: W.B. Yeats, Mysticism, Platonism, Sufism, Symbolism, Sailing to Byzantium, Neoplatonism.