I. After thanks for Julian's sympathy he complains of the deposition of Aetius from the archdeaconry.
Leo, bishop of Rome, to Julian, bishop of Cos.
I acknowledge in your letter, beloved, the feelings of brotherly love, in that you sympathize with us in true grief at the many grievous evils we have borne. But we pray that these things which the Lord has either allowed or wished us to suffer, may avail to the correction of those who live through them, and that adversities may cease through the cessation of offenses. Both which results will follow through the mercy of God, if only He remove the scourge and turn the hearts of His people to Himself. But as you, brother, are saddened by the hostilities which have raged around us, so I am made anxious because, as your letter indicates, the treacherous attacks of heretics are not set at rest in the church of Constantinople, and men seek occasion to persecute those who have been the defenders of the Catholic Faith. For so long as Aetius is removed from his office of archdeacon under pretence of promotion and Andrew is taken into his place, who had been cast off for associating with heretics; so long as respect is shown to the accusers of Flavian of holy memory, and the partners or disciples of that most pious confessor are put down, it is only too clearly shown what pleases the bishop of the church itself. Towards whom I put off taking action till I hear the merits of the case and await his own dealing with me in the letter our son Aetius tells me he will send, giving opportunity for voluntary correction, whereby I desire my vexation to be appeased. Nevertheless, I have written to our most clement Prince and the most pious Augusta about these things which concern the peace of the Church; and I do not doubt they will in the devoutness of their faith take heed lest a heresy already condemned should succeed in springing up again to the detriment of their own glorious work.
Source: Letters (New Advent)