“How much more in the case of the clergy and Church of the Romans, which from old until now presides over all the churches which are under the sun? Having surely received this canonically, as well as from councils and the apostles, as from the princes of the latter (Peter and Paul), and being numbered in their company, she is subject to no writings or issues in synodical documents, on account of the eminence of her pontificate …even as in all these things all are equally subject to her (the Church of Rome) according to sacerodotal law. And so when, without fear, but with all holy and becoming confidence, those ministers (the popes) are of the truly firm and immovable rock, that is of the most great and Apostolic Church of Rome.” (Maximus, in J.B. Mansi, ed. Amplissima Collectio Conciliorum, vol. 10)
“If the Roman see recognizes Pyrrhus [Patriarch of Constantinople] to be not only a reprobate but a heretic, it is certainly plain that everyone who anathematizes those who have rejected Pyrrhus, anathematizes the see of Rome that is, he anathematizes the Catholic Church. I need hardly add that he excommunicates himself also, if indeed he be in communion with the Roman see and the Church of God… It is not right that one who has been condemned and cast out by the Apostolic see of the city of Rome for his wrong opinions should be named with any kind of honour, until he be received by her, having returned to her — nay, to our Lord — by a pious confession and orthodox faith, by which he can receive holiness and the title of holy… Let him hasten before all things to satisfy the Roman see, for if it is satisfied all will agree in calling him pious and orthodox. For he only speaks in vain who thinks he ought to persuade or entrap persons like myself, and does not satisfy and implore the blessed pope of the most holy Church of the Romans, that is, the Apostolic see, which from the incarnate Son of God Himself, and also by all holy synods, according to the holy canons and definitions, has received universal and supreme dominion, authority and power of binding and loosing over all the holy Churches of God which are in the whole world — for with it the Word who is above the celestial powers binds and looses in heaven also. For if he thinks he must satisfy others, and fails to implore the most blessed Roman pope, he is acting like a man who, when accused of murder or some other crime, does not hasten to prove his innocence to the judge appointed by the law, but only uselessly and without profit does his best to demonstrate his innocence to private individuals, who have no power to acquit him.” (St. Maximus, a letter to Marinus, a priest of Cyprus, cited by The Catholic Encyclopedia, “St. Maximus of Contantinople”; the same letter is cited as Letter to Peter, in Mansi x, 692).
[p.s. after being persuaded of his error by St. Maximus, Pyrrhus consented to go to Rome, where in fact he condemned his former teaching, and was reconciled to the Church by the pope.]
“The extremities of the earth, and all in every part of it who purely and rightly confess the Lord look directly towards the most holy Roman Church and its confession and faith, as it were to a sun of unfailing light, awaiting from it the bright radiance of the sacred dogmas of our Fathers according to what the six inspired and holy councils have purely and piously decreed, declaring most expressly the symbol of faith. For from the coming down of the incarnate Word amongst us, all the Churches in every part of the world have held that greatest Church alone as their base and foundation, seeing that according to the promise of Christ our Saviour, the gates of hell do never prevail against it, that it has the keys of a right confession and faith in Him, that it opens the true and only religion to such as approach with piety, and shuts up and locks every heretical mouth that speaks injustice against the Most High.” (St. Maximus of Constantinople, letter from Rome, cited by The Catholic Encyclopdia, “St. Maximus of Contantinople”; the same work is found in Opuscula theologica et polemica, Migne, Patr. Graec. vol. 90).