IV. His personal presence at the council must be excused. The question at issue is a very grave one.
But the most august and Christian Emperor, being anxious that the disturbances may be set at rest with all speed, has appointed too short and early a date for the council of bishops, which he wishes held at Ephesus, in fixing the first of August for the meeting: for from the fifth of May, on which we received His Majesty's letter, most of the time remaining has to be spent in making complete arrangements for the journey of such priests as are competent to represent me. For as to the necessity of my attending the council also, which his piety suggested, even if there were any precedent for the request, it could by no means be managed now: for the very uncertain state of things at present would not permit my absence from the people of this great city: and the minds of the riotously-disposed might be driven to desperate deeds, if they were to think that I took occasion of ecclesiastical business to desert my country and the Apostolic See.
As then you recognize that it concerns the public good that with your merciful indulgence I should not deny myself to the affectionate prayers of my people, consider that in these my brethren, whom I have sent in my stead, I also am present with the rest who appear: to them I have clearly and fully explained what is to be maintained in view of the satisfactory exposition of the case which has been given me by the detailed report, and by the defendant's own statement to me. For the question is not about some small portion of our Faith on which no very distinct declaration has been made: but the foolish opposition that is raised ventures to impugn that which our Lord desired no one of either sex in the Church to be ignorant of.
For the short but complete confession of the Catholic creed which contains the twelve sentences of the twelve apostles is so well furnished with the heavenly panoply, that all the opinions of heretics can receive their death-blow from that one weapon. And if Eutyches had been content to receive that creed in its entirety with a pure and simple heart, he would at no point go astray from the decrees of the most sacred council of Nicæa, and he would understand that the holy Fathers laid this down, to the end that no mental or rhetorical ingenuity should lift itself up against the Apostolic Faith which is absolutely one.
Deign then, with your accustomed piety to do your best endeavour, that this blasphemous and foolish attack upon the one and only sacrament of man's salvation may be driven from all men's minds. And if the man himself, who has fallen into this temptation, recover his senses, so as to condemn his own error by a written recantation, let him not be denied communion with his order. Your clemency is to know that I have written in the same strain to the holy bishop Flavian also: that loving-kindness be not lost sight of, if the error be dispelled. Dated 13 June in the consulship of the illustrious Asturius and Protogenes (449).
Source: Letters (New Advent)