Letter 123: I do not doubt that your piety is aware how great is my devotion to the Catholic Faith, and with what care I am bound, God helping me, to guard against the Gospel of truth being withstood at any time by ignorant or disloyal men. And, therefore, after expressing to you my dutiful greetings which your clemency is ever bound to receive at my hands,...

Pope Leo the GreatEudocia Augusta|c. 455 AD|leo great
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To Eudocia Augusta [wife of Emperor Theodosius II, living in Jerusalem after 443], about the monks of Palestine.

I. A request that she use her influence with the monks of Palestine to restore order.

Leo, the bishop, to Eudocia Augusta.

I have no doubt that your piety is aware of my great devotion to the Catholic Faith, and of the care with which I am bound, with God's help, to guard against the Gospel of truth being opposed at any time by ignorant or disloyal people. Therefore, after expressing my dutiful greetings — which your clemency is always entitled to receive from me — I pray the Lord to gladden me with news of your safety, and to bring ever greater aid through your efforts to the preservation of that article of the Faith over which the minds of certain monks in the province of Palestine have been deeply disturbed. May your pious zeal help to destroy all confidence in such heretical perversity. For what but sheer destruction could be expected for men who were moved neither by the principles of God's mysteries, nor by the authority of the Scriptures, nor by the evidence of the sacred places themselves [the holy sites in Jerusalem and Palestine where Christ lived and died]? May it benefit the churches, then — as by God's favor it does benefit them — and may it benefit the entire human race which the Word of God took upon Himself at the Incarnation, that you have chosen to make your home in the land where the evidence of His wondrous deeds and the marks of His sufferings testify to our Lord Jesus Christ as not only true God but also true Man.

II. They are to be told that the Catholic Faith rejects both the Eutychian and the Nestorian extremes. He wishes to be informed how far she succeeds.

If, then, those who have erred revere and love the name of Catholic, and wish to be counted among the members of the Lord's body, let them reject the twisted errors they have rashly committed. Let them show repentance for their wicked blasphemies and acts of bloodshed. For the salvation of their souls, let them submit to the synodal decrees confirmed at the city of Chalcedon [the Council of Chalcedon, 451]. And because nothing but true faith and quiet humility leads to understanding the mystery of human salvation, let them believe what they read in the Gospel and confess in the Creed, and not entangle themselves with unsound doctrines. For just as the Catholic Faith condemns Nestorius [who taught that Christ was two separate persons], who dared to claim there were two persons in our one Lord Jesus Christ, so it also condemns Eutyches and Dioscorus [who taught that Christ had only one nature, absorbing His humanity into His divinity], who deny that true human flesh was assumed in the Virgin Mother's womb by the only-begotten Word of God.

If your efforts have any success in convincing these people — which will win you eternal glory — I ask your clemency to inform me by letter, so that I may have the joy of knowing you have reaped the fruit of your good work, and that they, through the Lord's mercy, have not perished. Dated June 15, in the consulship of the illustrious Opilio (453).

Modern English rendering for readability. See the 19th-century translation or original Latin/Greek for scholarly use.

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