SECOND PERIOD THE ATTIC PHILOSOPHY AND THE SOCRATICS. PLATO. ARISTOTLE
The sophists who travelled from city to city as itinerant teachers and received high fees for their courses were fully aware of the risk to which they exposed themselves when they took young people from the close circles of their families into their schools in order to initiate them into doctrines which were often enough in the sharpest contradiction to the old respected traditions. The sophistical education consisted in the introduction to particular sciences such as mathematics, astronomy and especially grammar, of which the sophists laid the foundations. The old sophists were honourable, highly respected men, who were not seldom entrusted by their native cities with diplomatic missions. The most gifted and original brain among the sophists was Protagoras of Abdera. Hippias of Elis came as an official ambassador more frequently to Sparta than Athens and apart from that travelled extensively in the rest of Greece, especially to Sicily and took a pleasure in delivering orations at Olympia.