Presocratics - Protagoras (sophists)

4 important questions on Presocratics - Protagoras (sophists)

What is physics vs nomos, and what does it mean?

Nature vs convention
They questioned whether the laws are natural or decided by social convention. They believed that justice is created for the weak.

What does the following quote mean?

A human being is the measure of all things, of those things that are that they are, and of those things that are not that they are not.

Humans always relate everything (moral values, customs etc) they see to themselves, while this might not be the best or the only way to interpret something.
Protagoras is a relativist: there is only the way things seem to us

Protagoras claimed he could help persons when he got paid whatever sum with what?

With becoming virtuous, since not everyone is equally virtuous by nature, according to him.
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What does this quote mean?

Concerning the gods I am not in a position to know either that they exist or that they do not, nor can I know what they look like, for many things prevent my knowing -- the subject is obscure, and human life is short.

Protagoras is agnostic, which means he could and would not wanted to say whether gods existed or not.

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