[39] [cap.11] But many, who are not able vigorously to refute the plausible inventions of the sophists, because they have not very much practised discussion by reason of their continued application to action, have taken refuge in the alliance of the only wise Being, and have besought him to become their defender. As one of the friends of Moses, when praying, says in his hymns, "Let the treacherous lips become mute;" [12] and how can they become mute if they are not curbed by the only [13] [14] being who has speech itself as his subject?