His theory of rhetoric was the first to borrow the devices of poetry and use them in speeches. He also developed such devices as alliteration, antithesis, and parallelisms. His students included Pericles, Thucydides, Isocrates, and Agathon, the playwright. Wrote a manual on speechwriting. Helped develop the parts of speech.
Perceptions is everything.
The truth is determined by what people perceive to be the truth. A. Tremendous impact on language use, culture, and politics of Greek period. A Sophist who was a great rival of Plato's, he advocated practical wisdom and morality against Plato's dogmatic truth. In this way he believed rhetoric could improve the nation.