οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well
(see also ἀμβλυώσσω): be dim-sighted, be purblind, be short-sighted
