(born on 490 B.C. / died on 420 B.C.)
Protagoras was a thinker from ancient Greece. Considered a sophist or a pre- Socratic, he was the author of the expression “man is the measure of all things”, which implies a relativism (all knowledge is relative to man). Thus, the same man can support some thing and then its opposite. If there are no truths, there are opinions, but only opinions (which is the exact opposite of what Plato stated in his Allegory of the Cave: that by straying and breaking free from opinions, we can get closer to truths, these metaphysical entities). He is also famous for his agnosticism: “Concerning the gods, I have no means of knowing whether they exist or not”, which had him exiled from the City of Athens and his work burned.


No thought