The Scripture of Western Ascension is a central text of medieval Taoist mysticism. Written by an unknown author in the fifth century A.D., it closely resembles the Tao te ching in structure and contents. Edited and commented on several times until the twelfth century, the text played an important role in Taoist religious thought. Kohn presents the first Western introduction to this aspect of traditional Chinese religion and culture. Through her careful textual study and fully annotated translation of the Scripture of Western Ascension, she delineates the history, structure, and contents of what mystical thought meant within the Taoist religion. She also discusses the religious background of the text and provides detailed analyses of the philosophical concepts of "The Physical Universe," "Mind, Knowledge, Language," and "The Way of the Sage."