Δελφῖνα νήχεσθαι διδάσκεις: ἐπὶ τῶν ἐν ἐκείνοις τινὰ παιδοτριβούντων, ἐν οἷς ἤσκηται → Teaching dolphins to swim: is applied to those who are teaching something among people who are already well versed in it
punishment: P. and V. τιμωρία, ἡ, τίσις, ἡ (Plato), ζημία, ἡ. P. κόλασις, ἡ, V. ποινή, ἡ, or pl. (rare P.), ἄποινα, τά (rare P.), ἀντίποινα, τά; see penalty.
personified: V. Νέμεσις, ἡ.