Abstract

The present article puts forward the existing relations between the thought of
Protagoras and of the scepticism represented by Pyrrho from Elis. Analyzing the concept of contradictions and putting in context the declaration of impossibility to contradict that the sophist would support, it shows up to what point his ontological conception, based on the fluctuation and the constant construction of the mundane reality on the part of every man, carries the impossibility to come to contradictions, even when two propositions contradict one another.
On a very near ontology, Pyrrho assumes the impossibility of speaking, also as a
consequence of the apprehension of the reality on the part of man. The suspension of
judgment (epoché), the indifference (adiaphoría), the impassivity (apátheia), the tranquillity (ataraxía) are, in the ground of action, the correspondence of aphasía in the ground of speech. The thought of this ancient sceptic gathers thus the line of ontological relativist conception of Protagoras, deepening even someone of its features.

Keywords: relativism, antilogies, scepticism, aphasia.