Note 28 — Chapter XXXIV · KLEITOPHON.
Reading edition
For example, That it is not the province of the just man to hurt any one, either friend or foe, Repub. p. 335 D.
Thrasymachus derides any such definitions of τὸ δίκαιον as the following — τὸ δέον — τὸ ὠφέλιμον — τὸ λυσιτελοῦν — τὸ ξυμφέρον — τὸ κερδάλεον, Repub. i. p. 336, C-D.
These are exactly the unsatisfactory definitions which Kleitophon describes himself (p. 409 C) as having received from the partisans of Sokrates.