οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well
Pennus: i, m.,I a Roman surname: T. Quinctius Pennus, Liv. 4, 26.