This volume contains the Ph.D. dissertation of Oskar Braun, who is otherwise especially known for his work on Syriac texts pertaining to the Church of the East. In this work, he offers a German translation of a fascinating work on “psychology” (in the ancient sense of the term, that is dealing with the “soul” in all its characteristics and aspects) from the Syrian Orthodox author Mushe bar Kipho (d. 903). An introduction touching on Mushe’s life, writings, and doctrine begins the book, and it ends with indices for Scriptural references and names mentioned in the work. This text from an author so multi-faceted as Mushe bar Kipho will be welcomed by students of Syriac literature for the variety and depth it adds.