Pring-Mill’s study depicts the prevalent, but often neglected worldview of the Middle Ages, according to which the macrocosm is a chain of created being ascending from the four elements of the material world to the numerologically structured celestial spheres up to the creator himself. Pring-Mill’s work reveals a fundamental correspondence between the three major religions: medieval Christians, Jews and Muslims all sought to describe their religious beliefs using the structures of the macrocosm. Ramon Lull’s (1232–1316) philosophy makes use of this idea in order to render Christian doctrine intelligible. In his dynamic conception, man is depicted as a microcosm, thus becoming the archetype of the macrocosm and, at the same time, the image of divine trinity. Pring-Mill’s study, therefore, is not only a guide to Llull’s complete oeuvre, but also an introduction to medieval thinking in general.