Nausiphanes
Nausiphanes (; lived c. 325 BC), a native of Teos, was attached to the philosophy of Democritus. He was a pupil of Pyrrho and a teacher to Epicurus, who was dissatisfied with him. Biography. Nausiphanes had a large number of pupils, and was particularly famous as a rhetorician. Epicurus was at one time one of his hearers, but was unsatisfied with him, and apparently abused him in his writings. The Pyrrhonist philosopher, Sextus Empiricus said this about Nausiphanes: Epicurus took the ground that the subjects taught are of no help in perfecting wisdom; and he did this, as some conjecture , because he saw in it a way of covering up his own lack of culture (for in many matters Epicurus stands convicted of ignorance, and even in ordinary converse his speech was not correct). Another reason may have been his hostility towards Plato and Aristotle and their like who were men of wide learning. It is not unlikely, too, that he was moved by his enmity against Nausiphanes, the disciple of Pyrrho, who kept his hold on many of the young men and devoted himself earnestly to the Arts and Sciences, especially Rhetoric. Epicurus, then, though he had been one  of this man’s disciples, did his best to deny the fact in order that he might, be thought to be a self-taught and original philosopher, and tried hard to blot out the reputation of Nausiphanes, and became a violent opponent of the Arts and Sciences wherein Nausiphanes prided himself. Thus, in his "Letter to the Philosophers in Mytilene", Epicurus says, “I quite suppose that ‘the bellowers’ will fancy that I am even a disciple of ‘the Stockfish,’ having sat under him in the company of some crapulous striplings”; where he calls Nausiphanes a “Stockfish,” as being without sense . And again, after proceeding further and abusing the man at length, he hints at his proficiency in Arts and Sciences when he says—“ In fact he was a sorry fellow and exercised himself on matters which cannot possibly lead to wisdom,” alluding thereby to Arts and Sciences. Such, in fact,—as we may conjecture—were the sort of motives which decided Epicurus to make war on the Arts and Sciences. Philosophy. Nausiphanes substituted the term akataplêxia (“undauntability”) for Democritus’ athambiê, “fearlessness,” as crucial for eudaimonia. He also argued that the study of natural philosophy (physics) was the best foundation for  studying rhetoric or politics. There is a polemic in Philodemus' "On Rhetoric" against Nausiphanes' view that the natural philosopher is the best orator. Epicurus may also have derived his three criteria of truth in his "Canon" from the "Tripod" of Nausiphanes. Only the following summary of the "Tripod" survives, written by Philodemus.