From Chapter 4 of the Commonitorium A.D. 434
(1) I have continually given the greatest pains and diligence to inquiring, from the greatest possible number of men outstanding in holiness and in doctrine, how I can secure a kind of fixed and, as it were, general and guiding principle for distinguishing the true Catholic Faith from the degraded falsehoods of heresy. And the answer that I receive is always to this effect; that if I wish, or indeed if anyone wishes, to detect the deceits of heretics that arise and to avoid their snares and to keep healthy and sound in a healthy faith, we ought, with the Lord's help, to fortify our faith in a twofold manner, firstly, that is, by the authority of God's Law, then by the tradition of the Catholic Church.
(2) Here, it may be, someone will ask, Since the canon of Scripture is complete, and is in itself abundantly sufficient, what need is there to join to it the interpretation of the Church? The answer is that because of the very depth of Scripture all men do not place one identical interpretation upon it. The statements of the same writer are explained by different men in different ways, so much so that it seems almost possible to extract from it as many opinions as there are men. Novatian expounds in one way, Sabellius in another, Donatus in another, Arius, Eunomius and Macedonius in another, Photinus, Apollinaris and Priscillian in another, Jovinian, Pelagius and Caelestius in another, and latterly Nestorius in another. Therefore, because of the intricacies of error, which is so multiform, there is great need for the laying down of a rule for the exposition of Prophets and Apostles in accordance with the standard of the interpretation of the Church Catholic.
(3) Now in the Catholic Church itself we take the greatest care to hold that which has been believed everywhere, always and by all. That is truly and properly 'Catholic,' as is shown by the very force and meaning of the word, which comprehends everything almost universally. We shall hold to this rule if we follow universality [i.e. oecumenicity], antiquity, and consent. We shall follow universality if we acknowledge that one Faith to be true which the whole Church throughout the world confesses; antiquity if we in no wise depart from those interpretations which it is clear that our ancestors and fathers proclaimed; consent, if in antiquity itself we keep following the definitions and opinions of all, or certainly nearly all, bishops and doctors alike.
(4) What then will the Catholic Christian do, if a small part of the Church has cut itself off from the communion of the universal Faith? The answer is sure. He will prefer the healthiness of the whole body to the morbid and corrupt limb. But what if some novel contagion try to infect the whole Church, and not merely a tiny part of it? Then he will take care to cleave to antiquity, which cannot now be led astray by any deceit of novelty. What if in antiquity itself two or three men, or it may be a city, or even a whole province be detected in error? Then he will take the greatest care to prefer the decrees of the ancient General Councils, if there are such, to the irresponsible ignorance of a few men. But what if some error arises regarding which nothing of this sort is to be found? Then he must do his best to compare the opinions of the Fathers and inquire their meaning, provided always that, though they belonged to diverse times and places, they yet continued in the faith and communion of the one Catholic Church; and let them be teachers approved and outstanding. And whatever he shall find to have been held, approved and taught, not by one or two only but by all equally and with one consent, openly, frequently, and persistently, let him take this as to be held by him without the slightest hesitation.
On this blog I have criticized the theory put forth by Cardinal Newman about Development of Doctrine, inasmuch as it runs contrary to the Vincentian Canon. Notice here the weight that St. Vincent gives to "antiquity," and think of that in relation to the Anglican emphasis on the early centuries of the Church, including the first millennium in which the Church was mostly unified; consider also the One Faith in Two Testaments, in Three Creeds, in Four [formulative] Councils,* and Five Centuries (Anglican 1,2,3,4,5-attributed to the writings of Lancelot Andrewes). To St. Vincent, the later ideas must be weighed by the earlier teaching that was universally accepted; not the other way around.
For more clarity on this, look at what he wrote in chapter 25 of the same work:
"But the Church of Christ, the careful and watchful guardian of the doctrines deposited in her charge, never changes anything in them, never diminishes, never adds, does not cut off what is necessary, does not add what is superfluous, does not lose her own, does not appropriate what is another's, but while dealing faithfully and judiciously with ancient doctrine, keeps this one object carefully in view,--if there be anything which antiquity has left shapeless and rudimentary, to fashion and polish it, if anything already reduced to shape and developed, to consolidate and strengthen it, if any already ratified and defined to keep and guard it. Finally, what other object have Councils ever aimed at in their decrees, than to provide that what was before believed in simplicity should in future be believed intelligently, that what was before preached coldly should in future be preached earnestly, that what was before practised negligently should thenceforward be practised with double solicitude? This, I say, is what the Catholic Church, roused by the novelties of heretics, has accomplished by the decrees of her Councils,--this, and nothing else,--she has thenceforward consigned to posterity in writing what she had received from those of olden times only by tradition, comprising a great amount of matter in a few words, and often, for the better understanding, designating an old article of the faith by the characteristic of a new name."
From the earliest days of Anglicanism, the goal has been fidelity to what the Church has believed from the beginning, rejecting nothing that custom has added to this by the wisdom of past generations concerning polity, but rejecting all doctrines and practices that cannot stand the two-fold test of antiquity and universal consent.
*In the first four Ecumenical Councils we see formulations of clarity and expression for dogmatic theology that were not restated in the final three, but only defended.