Agatho a bishop and servant of the servants of God to the most devout and serene victors and conquerors, our most beloved sons and lovers of God and of our Lord Jesus Christ, the Emperor Constantine the Great, and to Heraclius and Tiberius, Augustuses.

While contemplating the various anxieties of human life, and while groaning with vehement weeping before the one true God, in prayer that he might impart to my wavering soul the comfort of his divine mercy, and might lift me by his right hand out of the depths of grief and anxiety, I most gratefully recognize, my most illustrious lords and sons, that your purpose [i.e. of holding a Council] afforded me deep and wonderful consolation. For it was most pious and emanated from your most meek tranquillity, taught by the divine benignity for the benefit of the Christian commonwealth divinely entrusted to your keeping, that your imperial power and clemency might have a care to enquire diligently concerning the things of God (through whom Kings do reign, who is himself King of Kings and Lord of Lords) and might seek after the truth of his spotless faith as it has been handed down by the Apostles and by the Apostolic Fathers, and be zealously affected to command that in all the churches the pure tradition be held. And that no one may be ignorant of this pious intention of yours, or suspect that we have been compelled by force, and have not freely consented to the carrying into effect of the imperial decrees touching the preaching of our evangelical faith which was addressed to our predecessor Donus, a pontiff of Apostolic memory, they have through our ministry been sent to and entirely approved by all nations and peoples; for these decrees the Holy Spirit by his grace dictated to the tongue of the imperial pen, out of the treasure of a pure heart, as the words of an adviser not of an oppressor, defending himself, not looking with contempt upon others; not afflicting, but exhorting; and inviting to those things which are of God in godly wise, because he, the Maker and Redeemer of all men, who had he come in the majesty of his Godhead into the world, might have terrified mortals, preferred to descend through his inestimable clemency and humility to the estate of us whom he had created and thus to redeem us, who also expects from us a willing confession of the true faith.

Behold, most pious lords and sons, by the testimonies of the holy Fathers, as by spiritual rays, the doctrine of the Catholic and Apostolic Church has been illustrated and the darkness of heretical blindness, which is offering error to men for imitation, has been revealed. Now it is necessary that the new doctrine should follow somebody, and by whose authority it is supported, we shall note.

Let then your God-founded clemency with the internal eye of discrimination, which for the guidance of the Christian people you have been deemed worthy to receive by the Grace of God, take heed which one of such doctors you think the Christian people should follow, the doctrine of which one of these they should embrace so as to be saved; for they condemn all, and each one of them the other, according as the various and unstable definitions in their writings assert sometimes that there is one will and one operation, sometimes that there is neither one nor two operations, sometimes one will and operation, and again two wills and two operations, likewise one will and one operation, and again neither one, nor two, and somebody else one and two.

Who does not hate, and rage against, and avoid such blind errors, if he have any desire to be saved and seek to offer to the Lord at his coming a right faith? Therefore the Holy Church of God, the mother of your most Christian power, should be delivered and liberated with all your might (through the help of God) from the errors of such teachers, and the evangelical and apostolic uprightness of the orthodox faith, which has been established upon the firm rock of this Church of blessed Peter, the Prince of the Apostles, which by his grace and guardianship remains free from all error, [that faith I say] the whole number of rulers and priests, of the clergy and of the people, unanimously should confess and preach with us as the true declaration of the Apostolic tradition, in order to please God and to save their own souls.

We believe, most pious lords [singular in the Latin] of all things, that there has been left no possible ambiguity which can prevent the recognizing of those who have followed the inventors of new dogma. For the sweetness of spiritual understanding with which the sayings of the Fathers are full has become evident to the eyes of all; and the stench of the heretics, to be avoided by all the faithful, has been made notorious. Nor has it remained unknown that the inventors of new dogma have been shewn to be the followers of heretics, and not the walkers in the footsteps of the holy Fathers: therefore whoever wishes to colour any error of his whatever, is condemned by the light of truth, as the Apostle of the Gentiles says, “For everything that doth make manifest is light,” for the truth ever remains constant and the same, but falsehood is ever varying, and in its wanderings adopting things mutually contradictory. On this account the inventors of the new dogma have been shewn to have taught things mutually contradictory, because they were not willing to be followers of the Evangelical and Apostolic faith. Wherefore since the truth has shone forth by the observations of your God-inspired piety, and falsity which has been exposed has attained the contempt which it deserved, it remains that the crowned truth may shine forth victoriously through the pious favours of your God-crowned clemency; and that the error of novelty with its inventors and with those who follow their doctrine, may receive the punishment due their presumption, and be cast forth from the midst of the orthodox prelates for the heretical pravity of their innovation, which into the holy, Catholic and Apostolic Church of Christ they have endeavoured to introduce, and to stain with the contagion of heretical pravity the indivisible and unspotted body of the Church [of Christ]. For it is not just that the injurious should injure the innocent, nor that the offences of some should be visited upon the inoffensive, for even if in this world to the condemned mercy is extended, yet they who are thus spared reap for that sparing no benefit in the judgment of God, and by those thus sparing them there is incurred no little danger for their unlawful compassion.

And we are confident that what your pious clemency has promised, you are powerful to carry out, in order that what has been vowed and promised to God by the religious philanthropy beyond your Christian power, may nevertheless be fulfilled by the aid of his omnipotency.

Wherefore let praise by all Christian nations, and eternal memory, and frequent prayer be poured forth before the Lord Christ, whose is the cause, for your safety, and your triumphs, and your complete victory, that the nations of the Gentiles, being impressed by the terror of the supernal majesty, may lay down most humbly their necks beneath the sceptre of your most powerful rule, that the power of your most pious kingdom may continue until the ceaseless joy of the eternal kingdom succeeds to this temporal reign. Nor could anything be found more likely to commend the clemency of your unconquerable fortitude to the divine majesty, than that those who err from the rule of truth should be repelled and the integrity of our Evangelical and Apostolic faith should be everywhere set forth and preached.