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
P. αὐστηρότης, ἡ.
of temper: P. and V. πικρότης, ἡ. Ar. and P. δυσκολία, ἡ, P. αὐστηρότης, ἡ; see anger.