Gilson has made a good case for the difference between the city in the Stoic cosmos and Augustine's "city" in "City of God." And it reminds me sharply of one of my struggles with postliberal Catholics: how this new cosmic view (expressed by Augustine) produces confusion as much as clarification.
"[In Augustine] the City does more than extend to the limits of the earth or the world; it includes it and explains it... ... if we can have faith in the ultimate intelligibility of the smallest occurrence or the most humble being, the City of God holds its secret." (31)