Letter 156: Your clemency's letter, which was full of vigorous faith and of the light of truth, I have respectfully received, which I wish I could obey, even in the matter of my personal attendance, which your Majesty thinks necessary; for then I should gain the greater advantage from the sight of your splendour. But I believe you will approve of my view wh...

Pope Leo the GreatLeo Augustus|c. 459 AD|leo great
arianismbarbarian invasionchristologyillnessimperial politicsmonasticismpapal authority
Theological controversy; Imperial politics; Church council

Leo, Bishop of Rome, to Leo Augustus.

I. There is no need to reopen the question of doctrine now

Your clemency's letter, full of vigorous faith and the light of truth, I have received with the deepest respect. I wish I could comply even with the suggestion of my personal attendance, which your Majesty considers necessary, for I would gain great benefit from the sight of your splendor. But I trust you will approve my reasoning when I explain why I believe otherwise.

Since your clemency, with holy and spiritual zeal, consistently upholds the Church's peace, and since nothing is more conducive to the defense of the faith than to abide by what has been definitively settled under the unceasing guidance of the Holy Spirit, we would appear to be undermining the very decrees we ought to defend if, at the petition of heretics, we agreed to reopen questions that the universal Church has already resolved. To do so would remove all limits from the conflicts in the churches and, rather than calming disputes, would extend and inflame them.

After the disgraceful proceedings at the synod of Ephesus -- where, through the wickedness of Dioscorus, the Catholic faith was rejected and Eutyches' heresy was embraced -- nothing more beneficial could have been devised for the preservation of the Christian faith than what the holy Synod of Chalcedon accomplished: it rescinded those wicked acts and bestowed such care upon heavenly doctrine that no lingering doubt could remain in anyone's mind. The faith defined at Chalcedon is the faith of Nicaea, the faith of the Apostles, the faith of the universal Church. It needs no revision, and to suggest revision is to suggest that the Holy Spirit failed in His guidance.

II. The enemies of Chalcedon are enemies of the faith

Those who petition for the Council's decrees to be reconsidered reveal their true purpose: they wish not to clarify the faith but to destroy it. They cannot bear the light that exposed their error, and so they seek to extinguish it. But the truth, once proclaimed, cannot be unsaid. The five hundred and twenty bishops who spoke with one voice at Chalcedon spoke not their own words but the words of the Holy Spirit, and their decree stands forever.

We therefore counsel your Majesty with all the earnestness at our command: do not permit the faith to be placed in jeopardy again. Do not give heretics the opportunity to restate their blasphemies under the pretense of seeking clarification. The matter is closed. The faith is defined. Let the enemies of truth submit or depart, but let the truth itself remain unmoved.

III. He pledges his full support

We have sent our representatives to convey our position more fully and to work with your Majesty for the peace and security of the Church. Whatever measures your piety deems necessary for the enforcement of the Council's decrees, we support wholeheartedly. The Lord has given you the imperial authority not only for the governance of the state but for the protection of His Church, and we are confident that you will exercise this sacred trust with the same wisdom and firmness that have distinguished your reign.

Dated from Rome.

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

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