οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well
κεφαλαιῶ, -όω (Α)βλ. κεφαλαιώνω.