Analogy was a basic means of the interpretation of reality in late antique schools of philosophy, and among them in the Stoic philosophy, too. It was, at the same time, also a heuristic and didactic method. It played an important role in the philosophers’ activity of explaining the world, and in schoolbooks, like that of Cornutus, in giving a world-view. The analogical method served as a basis for the wellknown etymological explanations, too, and etymological explanation in turn played an important role in discovering the basic knowledge of the world, and in later times, it received a rhetoric justification among the common places of rhetoric. In this way it became part of rhetoric argumentation.