A wise man is 5 - the 4th century b.c. A group of professional teachers in Greece.In Athens as the center, they traveled around all over Greece.Their youth for rhetoric, debate and speech skills training.They teach youth participation, skills in public affairs.
In academic aspects, they are promoting debate, rhetoric.Second, they doubt the existence of god.Therefore, except in the aspect of linguistics, rhetoric, debate, wise men to challenge other doctrine, that is to say, the sages of the traditional culture to the doubts and negative attitude, and establish and develop a new discipline, namely, linguistics, rhetoric.
But in the late part of wise men change to teach knowledge, not for the purpose of cheat money charlatan.They play, confuse right and wrong, distorted the facts, concepts and reputation, so dubbed the "sophists", despised by the people, lost its original function.
