Letter 162: By the hand of Philoxenus agens in rebus. Leo the Bishop to Leo Augustus. I.

Pope Leo the GreatLeo Augustus|c. 460 AD|leo great
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Theological controversy; Imperial politics; Church council

Leo, Bishop of Rome, to Leo Augustus, by the hand of Philoxenus, agens in rebus.

I. The decrees of Chalcedon and Nicaea are identical and final

My mind exults with great joy in the Lord, and I have abundant cause for thanksgiving, now that I perceive your clemency's most excellent faith being enlarged in all things by the gifts of heavenly grace. The devotion of a priestly mind shines through your Majesty's communications, and it is beyond doubt that the Holy Spirit is working through you for the good of the whole Church. All the faithful should pray that your empire may be extended everywhere with glory, since besides your care for temporal affairs you so perseveringly exercise a religious foresight in the service of what is divine and eternal.

Your aim is that the Catholic faith -- which alone gives life to and sanctifies humanity -- should abide in one confession, and that the dissensions springing from the variety of earthly opinions should be driven away from that solid Rock upon which the city of God is built. These gifts of God will be granted to us if we show ourselves grateful for what has been bestowed and do not, as though what we have gained were nothing, seek the very opposite.

For to seek what has already been discovered, to reconsider what has been completed, and to demolish what has been defined -- what is this but to show no thanks for what has been given? The Council of Chalcedon defined nothing new. It confirmed what Nicaea established. It restated what the Apostles taught. The two councils speak with one voice, and whoever opposes the one opposes the other.

II. Heretics must not be allowed to reopen settled questions

The enemies of the truth know this well, and that is why they demand a new discussion: not because they seek understanding, but because they hope to overthrow what has been established. They have already been heard. They have already been answered. They have already been condemned. There is nothing left to discuss with them.

If your Majesty permits the faith to be debated again, the heretics will interpret this not as an exercise of fairness but as an admission that the Council's definition was uncertain. This will embolden them, confuse the faithful, and undo the peace that has been won at so great a cost.

We therefore urge you, most glorious emperor: hold firm to what has been defined. Enforce the Council's decrees. Silence those who agitate against the truth. And trust that the God who guided the Council's deliberations will sustain the faith it proclaimed to the end of the age.

Dated from Rome.

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

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