[317] Diogenes Laertius, in the Life of Zeno the Stoic. The reader must take care not to confound him with Zeno the Eclectic.
[318] Seneca, Ep. 65.
[319] Seneca, Nat. Quæst., ii., 15.
[320] Seneca, Nat. Quæst., iii., 10.
[321] Lactantius, Div. Inst., iii., 3.
[322] See under ἀρχαι.
[323] Plutarch, Concerning the Opinions of the Philosophers.
[324] Simplicius, Comm. in Aristot. Auscult. Nat., p. 7; ed. Ald.
[325] Marcus Antoninus, iv., 46.
[326] Ibid.