This paper bases on a (great!) wrongful act which was made to Greek philosophy, and especially to the pre-Socratic one: the unilateral abatement of the studies to those of cosmological nature. The big mutation would take place in Socrates’ time, who by the anthropology of the discourse takes philosophy to a theory of knowledge, through a program which would be perfected by Plato and especially by Aristotle. This is a point of view co-substantial to history of philosophy, which some times risks to charge in an alethic (good/bad) way a paradigm based on false discussions. Pre-Socratics were not only preoccupied by ontology, or even cosmology, as well as Aristotle was not a radical empirist. In the economy of thought the nuances are more important than a classification often made for our epistemological comfort.