Nasir-i Khusraw was a leading Ismaili poet and theologian-philosopher of the Fatimid period whose writings have had a major formative influence on the Ismaili communities of Iran, Afghanistan and Central Asia. The bulk of his surviving work was produced in exile in a remote mountainous region of Badakhshan where he sought refuge from persecution in his native district of Balkh. This is the first of his doctrinal treatises to be translated into English...