Hi Sextus, I forget what I said, but I hope it was something like this. Generally speaking, a comma represents a pause, for breath. The pause in speaking, and the comma in writing, should be timed to help clarify meaning by giving some separation to thoughts and ideas, where such separation is warranted.
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Clive"Made in PH i and iii" qualifies "the exposition of the Skeptic’s quest for and attainment of ataraxia". This is why I thought it wasn't necessary to write a comma before it. I'd prefer to say '. . . from the exposition, made in PH i and iii, of the Skeptic’s quest fo