Philosophy
The Sophist Protagoras in Plato’s Dialogues, His Biography and Fragments of His Works
Protagoras begins one of his works with “Man is the measure of all things, of things that are, that they are, and of things that are not, that they are not.”
The ancient author Sextus Empiricus also quotes this fragment, continuing the quote from Protagoras: “And for this reason he posits only what appears to the individual, thus introducing relativity.” “What Protagoras states then is this–that matter is in flux,” “and the senses are transformed and altered according to the times of life and to all other conditions of the bodies.” […]