οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well
P. στεγανός, V. στεγνός (Eur., Cyclops 324).
be waterproof, v.: P. and V. στέγειν.
