Note 9 — Chapter XXXVII · REPUBLIC — REMARKS ON THE PLATONIC COMMONWEALTH.
Reading edition
In some of the Platonic Dialogues these four varieties are not understood as exhausting the sum total of Virtue: ἡ ὁσιότης is included also; see Lachês, p. 199 D, Protagoras, p. 329 D, Euthyphron, pp. 5-6. Plato does not advert to τὸ ὅσιον in the Republic as a separate constituent, seemingly because on matters of piety he enjoins direct reference to Apollo and the Delphian oracle (Rep. iv. p. 427 B).