The Originary Structure (La struttura originaria, 1958) is the foundation of Italian philosopher Emanuele Severino's thought, the starting point that establishes and recognizes the essential tenets of the incontrovertibility and necessity of the 'truth of being'. The first book written by Severino, it lays out the logical structure that underlies the philosophical development of his thought for the next six decades. According to Severino himself, it constitutes the ground as part of which all his subsequent writings receive their own meaning - first and foremost because it aims to articulate the structure of the appearing and meaning of everything that is and appears, according to a logic that should prove itself unable to be refuted by any (non-) philosophical discourse. This book presents the fundamental determinations of a philosophical discourse that cannot be refuted, to the extent that any such refutation would itself be grounded in the discourse to be refuted. It is on the basis of this logical structure that Severino is able to exhibit the necessity of his most challenging claim - that of the eternity of every being. One of the most singular philosophical works written in the 20th century, The Originary Structure plays an irreplaceable role in the system of Severino's writings.