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. and V. εὐθύμως (Xen.), P. ἱλαρῶς (Xen.).
affably: P. and V. φιλοφρόνως (Plato), P. φιλανθρώπως.
