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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
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
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"?
441BCE works (all lost)
p.16 There is no more purely metaphysical doctrine than Protagorean relativism
p.49 If my hot wind is your cold wind, then wind is neither hot nor cold, and so not as cold as itself
p.54 You can only state the problem of the relative warmth of an object by agreeing on the underlying object
p.63 For Protagoras the only bad behaviour is that which interferes with social harmony
p.175 God is "the measure of all things", more than any man
p.187 Protagoras seems to have made the huge move of separating punishment from revenge
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
p.289 Protagoras absurdly thought that the knowing or perceiving man is 'the measure of all things'
p.331 Relativists think if you poke your eye and see double, there must be two things
p.441 Early sophists thought convention improved nature; later they said nature was diminished by it
A1 p.211 Protagoras was the first to claim that there are two contradictory arguments about everything
A23 p.219 He said he didn't know whether there are gods - but this is the same as atheism
B07 p.220 No perceptible object is truly straight or curved
B11 p.127 Successful education must go deep into the soul