Böhme's longest and most philosophically ambitious work — a verse-by-verse meditation on the first book of Genesis that unfolds his complete cosmogony: from the primordial Ungrund through the fall of Lucifer, the creation of Adam and Eve, and the nature of original sin. Each stage of the biblical narrative becomes a map of both cosmic structure and psychological transformation. Schelling and Hegel would later mine Mysterium Magnum for the conceptual resources of German Idealist philosophy.