οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well
lightness: P. κουφότης, ἡ, ἐλαφρότης, ἡ.
quickness: P. ταχύτης, ἡ.
