Note 22 — Chapter XXVIII · THEÆTETUS.
Reading edition
Plato, Timæus, p. 51 B-E, compare Republic, v. p. 477.
See this reasoning of Plato set forth in Zeller, Die Phil. der Griech. vol. ii. pp. 412-416, ed. 2nd.
Nous, according to Plato (Tim. 51 E), belongs only to the Gods and to a select few among mankind. It is therefore only to the Gods and to these few men that Νοητὰ exist. To the rest of mankind Νοητὰ are non-apparent and non-existent.