λέγουσι γὰρ οἱ Στωϊκοὶ τὸν μὲν οὐρανὸν κυρίως πόλιν τὰ δὲ ἐπὶ γῆς ἐνταῦθα οὐκ ἔτι πόλεις, λέγεσθαι γὰρ, οὐκ εἶναι δέ: 1