quality:correction, linguistic:voice_change, quality:corruption, structural:scholar_edition
Protagoras

Protagoras was one of the best known and most successful sophists of his era; however, some later philosophers, such as Sextus Empiricus treat him as a founder of a philosophy rather than as a sophist. Protagoras taught his students the necessary skills and knowledge for a successful life, particularly in politics. He trained his pupils to argue from both points of view because he believed that truth could not be limited to just one side of the argument. Protagoras wrote about a variety of subjects and advanced several philosophical ideas, particularly in epistemology. Some fragments of his works have survived. He is the author of the famous saying, "Man is the measure of all things", which is the opening sentence of a work called Truth.