οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well
sos: arch. contr. form. 1 For eos; v. is init.— 2 For suos; v. suus init.
