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Ideas of Protagoras, by Text

[Greek, c.481 - 411 BCE, Born at Abdera, in northern Greece. Died in Sicily.]

445BCE Contradictions (frags)
p.160 Protagoras says arguments on both sides are always equal [Seneca]
B06a p.126 There are two contradictory arguments about everything
441BCE Truth (frags)
B01 p.84 Not every person is the measure of all things, but only wise people [Plato]
B01 p.211 Man is the measure of all things - of things that are, and of things that are not
B01 p.215 Why didn't Protagoras begin by saying "a tadpole is the measure of all things"? [Plato]
441BCE works (all lost)
p.16 There is no more purely metaphysical doctrine than Protagorean relativism [Benardete,JA]
p.49 If my hot wind is your cold wind, then wind is neither hot nor cold, and so not as cold as itself [Benardete,JA]
p.54 You can only state the problem of the relative warmth of an object by agreeing on the underlying object [Benardete,JA]
p.63 For Protagoras the only bad behaviour is that which interferes with social harmony [Roochnik]
p.99 Protagoras contradicts himself by saying virtue is teachable, but then that it is not knowledge [Plato]
p.175 God is "the measure of all things", more than any man [Plato]
p.187 Protagoras seems to have made the huge move of separating punishment from revenge [Vlastos]
p.214 Everything that exists consists in being perceived
p.219 He spent public money on education, as it benefits the individual and the state [Diodorus of Sicily]
p.289 Protagoras absurdly thought that the knowing or perceiving man is 'the measure of all things' [Aristotle]
p.331 Relativists think if you poke your eye and see double, there must be two things [Aristotle]
p.441 Early sophists thought convention improved nature; later they said nature was diminished by it [Miller,FD]
A1 p.211 Protagoras was the first to claim that there are two contradictory arguments about everything [Diog. Laertius]
A23 p.219 He said he didn't know whether there are gods - but this is the same as atheism [Diogenes of Oen.]
B07 p.220 No perceptible object is truly straight or curved
B11 p.127 Successful education must go deep into the soul