In this work a distinguished scholar of Islamic religion examines the mysticism and psychological thought of the great eleventh-century Persian philosopher and physician Avicenna (Ibn Sina), author of over a hundred works on theology, logic, medicine, and mathematics. Henry Corbin's discovery in an Istanbul library of the manuscript of a Persian translation of and commentary on Avicenna's Hayy ibn Yaqzan, written in Arabic, led him to an analysis of three of Avicenna's mystical "recitals." These form an initiatory cycle leading the adept along the path of spiritual progress. In Part I Corbin summarizes the great themes that show the philosophical situation of Avicennan man in the cosmos and presents translations of these three great Avicennan recitals. Part II is a complete translation, with notes, of the Persian commentary.