(Labbe and Cossart, Concilia, Tom. VII., col. 577.)
To our most religious and most serene princes, Constantine and Irene his mother. Tarasius, the unworthy bishop of your God-protected royal city, new Rome, and all the holy Council which met at the good pleasure of God and upon the command of your Christ-loving majesty in the renowned metropolis of Nice, the second council to assemble in this city.
Christ our God (who is the head of the Church) was glorified, most noble princes, when your heart, which he holds in his hands, gave forth that good word bidding us to assemble in his name, in order that we might strengthen our hold on the sure, immovable, and God-given truth contained in the Church’s dogmas. As your heads were crowned with gold and most brilliant stones, so likewise were your minds adorned with the precepts of the Gospel and the teachings of the Fathers. And being the disciples and companions, as it were, of those whose sounds went forth into all the earth, you became the leaders in the way of piety of all who bore the name of Christ, setting forth clearly the word of truth, and giving a brilliant example of orthodoxy and piety; so that you were to the faithful as so many burning lamps. The Church which was ready to fall, you upheld with your hands, strengthening it with sound doctrine, and bringing into the unity of a right judgment those who were at variance. We may therefore well say with boldness that it was through you that the good pleasure of God brought about the triumph of godliness, and filled our mouth with joy and our tongue with gladness. And these things our lips utter with a formal decree. For what is more glorious than to maintain the Church’s interests; and what else is more calculated to provoke our gladness?
Certain men rose up, having the form of godliness, inasmuch as they were clothed with the dignity of the priesthood, but denying the power thereof; and thus deserving for themselves the charge of being but priests of Babylon. Of such the word of prophecy had before declared that lawlessness went forth from the priests of Babylon. Nay more, they banded themselves together in a sanhedrim, like to that which Caiaphas held, and became the propagators of ungodly doctrines. And having a mouth full of cursing and bitterness, they thought to win the mastery by means of abusive words. With a slanderous tongue and a pen of a like character, and objecting to the very terms used by God himself, they devised marvellous tales, and then proceeded to stigmatise as idolaters the royal priesthood and the holy nation, even those who had put on Christ, and by his grace had been kept safe from the folly of idols. And having a mind set upon evil, they took in hand unlawful deeds, thinking to suppress altogether the depicting of the venerable images. Accordingly, as many icons as were set in mosaic work they dug out, and those which were in painted waxwork, they scraped away; thus turning the comely beauty of the sacred temples into complete disorder. Among doings of this sort, it is to be specially noted that the pictures set up on tablets in memory of Christ our God and of his Saints, they gave over to the flames. Finally, in a word, having desecrated our churches, they reduced them to utter confusion. Then some bishops became the leaders of this heresy and where before was peace, they fomented strife among the people; and instead of wheat sowed tares in the Church’s fields. They mingled wine with water, and gave the foul draught to those about them. Although but Arabian wolves, they hid themselves under sheeps’ clothing, and by specious reasoning against the truth sought to commend their lie. But all the while they hatched asps’ eggs and wove a spider’s web, as says the prophet; and he that would eat of their eggs, having crushed one, found it to be addled, with a basilisk within it, and giving forth a deadly stench.
In such a state of affairs, with a lie busy destroying the truth, you, most gracious and most noble princes, did not idly allow so grave a plague, and such soul-destroying error long to continue in your day. But moved by the divine Spirit which abides in you, you set yourselves with all your strength utterly to exterminate it, and thus preserve the stability of the Church’s government, and likewise concord among your subjects; so that your whole empire might be established in peace agreeably with the name [Irene] you bear. You rightly reasoned, that it was not to be patiently endured, that while in other matters we could be of one mind and live in concord, yet in what ought to be the chief concern of our life, the peace of the Churches, there was among us strife and division. And that too, when Christ being our head, we ought to be members one of another, and one body, by our mutual agreement and faith. Accordingly, you commanded our holy and numerously-attended council to assemble in the metropolis of Nice, in order that after having rid the Church of division, we might restore to unity the separated members, and might be careful to rend and utterly destroy the coarse cloak of false doctrine, which they had woven of thorn fibre, and unfold again the fair robe of orthodoxy.