III. He wishes to know the effect of his letter to the Empress Eudocia.
And, because the most clement Emperor has been pleased to charge me secretly by our son Paulus with the task of admonishing our daughter the most clement Augusta Eudocia, I have done what he wished, in order that from my letter she may learn how profitable it will be to her if she espouses the cause of the Catholic Faith, and have managed that she should further be admonished by a letter from that most clement prince her son; nothing doubting that she herself, too, will set to work with pious zeal to bring the leaders of sedition to a knowledge of the consequences of their action, and, if they understand not the utterances of those who teach them, to make them at least afraid of the powers of those who will punish them.
And so what effect this care of ours produces, I wish to know at once by a letter from you, beloved, and whether their ignorant contumacy has at length subsided: as to which if they think there is any doubt about our teaching, let them at least not reject the writings of such holy priests as Athanasius, Theophilus and Cyril of Alexandria, with whom our statement of the Faith so completely harmonizes that any one who professes consent to them disagrees in nothing with us.
Source: Letters (New Advent)