The Polish version of the article was published in “Roczniki Humanistyczne,” vol. 58–59 (2010–2011), issue 3 Protagoras is an exceptional dialogue of Plato as it uses two modes of expression: mythos and logos. Both are used by Protagoras in Great Speech, but the first one seems to be the most important. Protagoras chose the mythical mode of expression when he described to Socrates how he makes his pupils good citizens and politicians. The famous sophist told the story about two brothers: Prometheus and Epimetheus. It is easy to notice that Protagoras identifies with the clever Prometheus. However, the attentive reader can notice that Prometheus from Protagoras’ myth made a decision with fatal consequences. He entrusts his brother Epimetheus...