This app is intended to introduce and provide greater familiarity with the book Marefat ol-Ruh (Knowing the Spirit, 1969), the second published work of Nur Ali Elahi (later Ostad Elahi, 1895-1974). Marefat ol-Ruh represents the culmination of Ostad Elahi’s extensive theological and philosophical research, as well as his exploration of the various dimensions of the human spirit. Considered to be among his theoretical works, its publication in the second half of the 20th century suggests that Ostad Elahi was seeking to revive the discursive tradition of philosophical-theological discourse. The supplemental articles and expositions by other researchers and scholars in the field provide essential contextual background and additional analyses of Ostad Elahi’s findings.