公元前5世纪中叶,希腊城邦涌现出一批专门从事传授修辞学和辩论术为职业的教师,哲学史上称之为“智者派”。早期智者派的主要代表人物之一———高尔吉亚是智者中著名的演说家和修辞学家。他在著作《论非存在或论自然》中提出了三个著名的命题:(一)无物存在;(二)如果有某物存在 In the mid-5th century BC, a group of teachers who specialized in teaching rhetoric and debating techniques emerged in the Greek city-states. In the history of philosophy they were called “wise men”. One of the main representatives of the early wise school --- Gorgia is a famous orator and rhetorician among wise men. In his book On Non-existent or On Nature, he put forward three famous propositions: (1) nothing exists; (2) if there is something