Definition of Terms:

  • Septuagint: the earliest extant Greek translation of the Hebrew Bible 
  • Deposit of Faith:  The entirety of the teachings, commands, traditions, and examples left by Christ with the Apostles.

Sacred Tradition and the Development of Christian Doctrine

The term tradition is derived from the Latin trāditiō, from trādere, meaning “to hand over” or “to transmit.” In Christian theology, Sacred Tradition refers to the teachings, practices, and beliefs that have been handed down from the time of Christ and the Apostles through the life and worship of the Church. According to Catholic understanding, this Tradition encompasses the full “deposit of faith” entrusted to the Apostles, preserved and transmitted both orally and, later, in written form—including the Scriptures. Sacred Tradition is thus not in opposition to Scripture but provides the interpretive framework within which Scripture is rightly understood.

The concept of Sacred Tradition has deep roots in Judaism. Jewish belief holds that Moses received not only the written Torah but also an Oral Torah—a body of teachings, interpretations, and legal rulings passed down orally through generations of sages. These oral traditions were eventually codified in texts such as the Mishnah (circa 2nd century CE) and the Talmud, which contain and expand upon the interpretation of the Hebrew Scriptures. For Judaism, as for early Christianity, divine revelation was understood to encompass both written and unwritten forms.

The New Testament contains early affirmations of this twofold mode of transmission. For instance, 2 Peter 3:16 notes that parts of Scripture are difficult to understand and are subject to distortion. Similarly, in Acts 8:30–31, the Ethiopian eunuch acknowledges his need for guidance in understanding Scripture, highlighting the necessity of authoritative interpretation. The Apostle Paul explicitly affirms the transmission of tradition in several passages:

  • 1 Corinthians 11:2: “I commend you because you remember me in everything and maintain the traditions even as I have delivered them to you.”
  • 2 Thessalonians 2:15: “Stand firm and hold to the traditions which you were taught by us, either by word of mouth or by letter.”
  • 2 Timothy 2:2: “What you have heard from me before many witnesses entrust to faithful men who will be able to teach others also.”

The Bible itself is a product of Tradition. Jesus did not write any texts nor command the Apostles to produce a written compendium of His teachings. Instead, He commissioned them to “go and make disciples of all nations… teaching them to observe all that I have commanded you” (Matt. 28:19–20). As John 21:25 states, “There are many other things that Jesus did; if every one of them were written down, I suppose the world itself could not contain the books that would be written.” The earliest New Testament writings appeared decades after Christ’s resurrection, composed by the Apostles or their disciples in response to specific needs within already established Christian communities. These texts were not initially intended as a comprehensive catechism but as occasional writings addressing pastoral and theological concerns.

Following the apostolic age, the Church Fathers played a crucial role in preserving and articulating Sacred Tradition. Writers such as Irenaeus of Lyons emphasized the importance of apostolic succession and the rule of faith (κανών της πίστης), asserting that the true teaching of Christ is safeguarded in the Church’s historical and spiritual continuity with the Apostles. Irenaeus opposed groups like the Gnostics, who used select scriptural texts to support novel doctrines, by appealing to the continuous and public tradition of the Church. This “living Tradition” was understood to be in harmony with Scripture, forming together the complete deposit of divine revelation.

It was this same early Church that preserved, circulated, and ultimately canonized the books of the New Testament. The process of recognizing which texts bore apostolic authority and doctrinal fidelity was guided by the Tradition of the Church, culminating in the canon lists affirmed in the fourth and fifth centuries. Without the interpretive and preservational role of the Church, the New Testament as we know it would not exist in its present form.

The Reformation and the Principle of Sola Scriptura

For the first fifteen centuries of Christianity, the normative understanding of divine revelation encompassed both Scripture and Sacred Tradition. While Scripture was revered as inspired and authoritative, it was understood within the living tradition of the Church. The Protestant Reformation marked a significant shift with the introduction of the principle of sola scriptura—that Scripture alone is the sole infallible rule of faith.

This principle was articulated by Martin Luther during the Leipzig Debate in 1519, in response to Johann Eck’s charge that Luther’s views departed from established Church teachings and councils. Sola scriptura thus emerged, not from a comprehensive exegetical reevaluation of Scripture, but as part of a larger polemical and theological response to ecclesial authority. Over time, Protestants sought biblical passages to support this principle, including Mark 7:7–13, where Jesus rebukes the Pharisees for placing human tradition above God’s command:

“You have a fine way of rejecting the commandment of God in order to establish your tradition… thus making void the word of God by your tradition that you have handed down.”

However, the context of this passage is often misunderstood. Jesus is specifically addressing the korban practice, where individuals dedicated money or goods to the temple rather than using those resources to care for their parents—thereby violating the commandment to honor father and mother (Mark 7:10–13). What Christ condemns here is not tradition per se, but man-made customs that subvert divine law. His critique is aimed at traditions that nullify God’s commandments, not at the concept of tradition itself.

Indeed, Scripture elsewhere affirms the importance of preserving apostolic tradition (cf. 1 Cor. 11:2; 2 Thess. 2:15; 2 Tim. 2:2). From a Catholic theological standpoint, the principle of sola scriptura inadvertently replaces apostolic tradition with a new human tradition, one which denies the very command of Scripture to preserve and transmit the apostolic faith as it was handed down.

Another frequently cited passage is 2 Timothy 3:16–17:

“All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the servant of God may be thoroughly equipped for every good work.”

This verse certainly affirms the divine inspiration and great value of Scripture. However, several contextual considerations complicate its use in defense of sola scriptura:

  1. Undefined Canon: The verse speaks of “all Scripture” without identifying which writings are included. At the time 2 Timothy was written, the New Testament canon had not yet been assembled or universally recognized.
  2. Historical Reference Point: Timothy, a Greek-speaking Christian, would likely have known the Septuagint, the Greek Old Testament, which included books such as Tobit, Sirach, Maccabees, and Baruch. If this passage affirms the sufficiency of Scripture, it would presumably include those texts—many of which were later excluded from Protestant canons.
  3. Lack of Exclusivity: The passage states that all Scripture is “useful,” but it does not assert that Scripture alone is sufficient or exclusive as the sole rule of faith.
  4. Ecclesial Authority: The early Church determined which books were considered Scripture through conciliar discernment guided by Sacred Tradition. The authority to define the canon itself presupposes a teaching authority beyond Scripture alone.

Moreover, nowhere in Scripture is there an explicit command to rely on Scripture alone as the sole rule of faith. Rather, Jesus entrusted His authority to the Apostles and their successors, instructing them to teach all nations and promising that He would be with them always (Matt. 28:19–20). He established a Church, not merely a book, as the pillar and foundation of truth (cf. 1 Tim. 3:15).

The understanding of the early Church was that Scripture, Sacred Tradition, and the Magisterium (the Church’s teaching authority) together safeguard and transmit the faith once delivered to the saints (Jude 1:3). It was through this framework that the early Church preserved, discerned, and canonized the books of the Bible. Without the context of Sacred Tradition and the authority of the early Church, the formation and interpretation of Scripture as we have it today would not have been possible.

Bible Verses:

1 Corinthians 11:2

“I commend you because you remember me in everything and maintain the traditions even as I have delivered them to you.”

2 Thessalonians 2:15

“So then, brethren, stand firm and hold to the traditions which you were taught by us, either by word of mouth or by letter.”

2 Thessalonians 3:6

“Now we command you, brethren, in the name of our Lord Jesus Christ, that you keep away from any brother who is living in idleness and not in accord with the tradition that you received from us.”

2 Timothy 2:2

“What you have heard from me before many witnesses entrust to faithful men who will be able to teach others also.”

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Church Father Quotes:

Papias of Hierapolis (60-163 A.D.)

“[THE writings of Papias in common circulation are five in number, and these are called an Exposition of the Oracles of the Lord. Irenaeus makes mention of these as the only works written by him, in the following words: “Now testimony is borne to these things in writing by Papias, an ancient man, who was a hearer of John, and a friend of Polycarp, in the fourth of his books; for five books were composed by him.” Thus wrote Irenaeus. Moreover, Papias himself, in the introduction to his books, makes it manifest that he was not himself a hearer and eye-witness of the holy apostles; but he tells us that he received the truths of our religion from those who were aquainted with them [the apostles] in the following words:]

But I shall not be unwilling to put down, along with my interpretations, whatsoever instructions I received with care at any time from the elders, and stored up with care in my memory, assuring you at the same time of their truth. For I did not, like the multitude, take pleasure in those who spoke much, but in those who taught the truth; nor in those who related strange commandments, but in those who rehearsed the commandments given by the Lord to faith, and proceeding from truth itself. If, then, any one who had attended on the elders came, I asked minutely after their sayings,–what Andrew or Peter said, or what was said by Philip, or by Thomas, or by James, or by John, or by Matthew, or by any other of the Lord’s disciples: which things Aristion and the presbyter John, the disciples of the Lord, say. For I imagined that what was to be got from books was not so profitable to me as what came from the living and abiding voice.” Fragments left from the works of Papias I. Translated by Alexander Roberts and James Donaldson.  From Ante-Nicene FathersVol. 1. Edited by Alexander Roberts, James Donaldson, and A. Cleveland Coxe. (Buffalo, NY: Christian Literature Publishing Co., 1885.)

“He moreover hands down, in his own writing, other narratives given by the previously mentioned Aristion of the Lord’s sayings, and the traditions of the presbyter John. For information on these points, we can merely refer our readers to the books themselves; but now, to the extracts already made, we shall add, as being a matter of primary importance, a tradition regarding Mark who wrote the Gospel, which he [Papias] has given in the following words]: And the presbyter said this. Mark having become the interpreter of Peter, wrote down accurately whatsoever he remembered. It was not, however, in exact order that he related the sayings or deeds of Christ. For he neither heard the Lord nor accompanied Him. But afterwards, as I said, he accompanied Peter, who accommodated his instructions to the necessities [of his hearers], but with no intention of giving a regular narrative of the Lord’s sayings. Wherefore Mark made no mistake in thus writing some things as he remembered them. For of one thing he took especial care, not to omit anything he had heard, and not to put anything fictitious into the statements. [This is what is related by Papias regarding Mark; but with regard to Matthew he has made the following statements]: Matthew put together the oracles [of the Lord] in the Hebrew language, and each one interpreted them as best he could. [The same person uses proofs from the First Epistle of John, and from the Epistle of Peter in like manner. And he also gives another story of a woman who was accused of many sins before the Lord, which is to be fount in the Gospel according to the Hebrews.]” –Fragments left from the works of Papias VI. Translated by Alexander Roberts and James Donaldson.  From Ante-Nicene FathersVol. 1. Edited by Alexander Roberts, James Donaldson, and A. Cleveland Coxe. (Buffalo, NY: Christian Literature Publishing Co., 1885.)

Polycarp of Smyrna (69-155 A.D.)

“Wherefore, forsaking the vanity of many, and their false doctrines, let us return to the word which has been handed down to us from the beginning; staying awake in prayer, and persevering in fasting; beseeching in our supplications the all-seeing God ‘not to lead us into temptation,’ as the Lord has said: ‘The spirit truly is willing, but the flesh is weak’ (Matt. 26:41).” – Letter to the Philippians 7 (Written 135 A.D.)

“The Epistles of Ignatius written by him to us, and all the rest [of his Epistles] which we have by us, we have sent to you, as you requested. They are subjoined to this Epistle, and by them you may be greatly profited; for they treat of faith and patience, and all things that tend to edification in our Lord.” –Epistle of Polycarp to the Philippians, Ch. 13

“For neither can I nor anyone like me match the wisdom of the blessed and glorious Paul. When he was among you, face to face with the men of that time, he expounded the word of truth accurately and authoritatively; and when he was absent he wrote letters to you, the study of which will enable you to build yourselves up in the faith which was given to you…” –Letter to the Philippians 3:1. (Written in 135 A.D.)

Irenaeus of Lyons (130-202 A.D.)

“As I said before, the Church, having received this preaching and this faith, although she is disseminated throughout the whole world, yet guarded it, as if she occupied but one house. She likewise believes these things just as if she had but one soul and one and the same heart; and harmoniously she proclaims them and teaches them and hands them down, as if she possessed but one mouth. For, while the languages of the world are diverse, nevertheless, the authority of the tradition is one and the same” (Against Heresies 1:10:2 [A.D. 189]).

“That is why it is surely necessary to avoid them [heretics], while cherishing with the utmost diligence the things pertaining to the Church, and to lay hold of the tradition of truth. . . . What if the apostles had not in fact left writings to us? Would it not be necessary to follow the order of tradition, which was handed down to those to whom they entrusted the churches?” (ibid., 3:4:1).

“It is possible, then, for everyone in every church, who may wish to know the truth, to contemplate the tradition of the apostles which has been made known throughout the whole world. And we are in a position to enumerate those who were instituted bishops by the apostles and their successors to our own times—men who neither knew nor taught anything like these heretics rave about.

“But since it would be too long to enumerate in such a volume as this the successions of all the churches, we shall confound all those who, in whatever manner, whether through self-satisfaction or vainglory, or through blindness and wicked opinion, assemble other than where it is proper, by pointing out here the successions of the bishops of the greatest and most ancient church known to all, founded and organized at Rome by the two most glorious apostles, Peter and Paul, that church which has the tradition and the faith which comes down to us after having been announced to men by the apostles.

“With this church, because of its superior origin, all churches must agree—that is, all the faithful in the whole world—and it is in her that the faithful everywhere have maintained the apostolic tradition” (ibid., 3:3:1–2).

Clement of Alexandria (150-215 A.D.)

“Well, they preserving the tradition of the blessed doctrine derived directly from the holy apostles, Peter, James, John, and Paul, the sons receiving it from the father (but few were like the fathers), came by God’s will to us also to deposit those ancestral and apostolic seeds. And well I know that they will exult; I do not mean delighted with this tribute, but solely on account of the preservation of the truth, according as they delivered it. For such a sketch as this, will, I think, be agreeable to a soul desirous of preserving from loss the blessed tradition” (Miscellanies 1:1 [A.D. 208]).

Tertullian of Carthage (155-220 A.D.)

“[The apostles] founded churches in every city, from which all the other churches, one after another, derived the tradition of the faith, and the seeds of doctrine, and are every day deriving them, that they may become churches. Indeed, it is on this account only that they will be able to deem themselves apostolic, as being the offspring of apostolic churches. Every sort of thing must necessarily revert to its original for its classification. Therefore the churches, although they are so many and so great, comprise but the one primitive Church, [founded] by the apostles, from which they all [spring]. In this way, all are primitive, and all are apostolic, while they are all proved to be one in unity.” –Demurrer Against the Heretics 20 [A.D. 200]).

“[W]hat it was which Christ revealed to them [the apostles] can, as I must here likewise prescribe, properly be proved in no other way than by those very churches which the apostles founded in person, by declaring the gospel to them directly themselves . . . If then these things are so, it is in the same degree manifest that all doctrine which agrees with the apostolic churches—those molds and original sources of the faith must be reckoned for truth, as undoubtedly containing that which the churches received from the apostles, the apostles from Christ, [and] Christ from God. Whereas all doctrine must be prejudged as false which savors of contrariety to the truth of the churches and apostles of Christ and God. It remains, then, that we demonstrate whether this doctrine of ours, of which we have now given the rule, has its origin in the tradition of the apostles, and whether all other doctrines do not ipso facto proceed from falsehood.” –Demurrer Against the Heretics 21 [A.D. 200]

Hippolytus of Rome (170-235 A.D.)

“Justinus was entirely opposed to the teaching of the holy Scriptures, and moreover to the written and oral teaching of the blessed evangelists” –The Refutation of All Heresies Book V, Chapter 18

Origen of Alexandria (184-253 A.D.)

“Although there are many who believe that they themselves hold to the teachings of Christ, there are yet some among them who think differently from their predecessors. The teaching of the Church has indeed been handed down through an order of succession from the apostles and remains in the churches even to the present time. That alone is to be believed as the truth which is in no way at variance with ecclesiastical and apostolic tradition” (The Fundamental Doctrines 1:2 [A.D. 225]).

Cyprian of Carthage (200-258 A.D.)

“[T]he Church is one, and as she is one, cannot be both within and without. For if she is with Novatian, she was not with [Pope] Cornelius. But if she was with Cornelius, who succeeded the bishop Fabian by lawful ordination, and whom, beside the honor of the priesthood the Lord glorified also with martyrdom, Novatian is not in the Church; nor can he be reckoned as a bishop, who, succeeding to no one, and despising the evangelical and apostolic tradition, sprang from himself. For he who has not been ordained in the Church can neither have nor hold to the Church in any way” (Letters 75:3 [A.D. 253]).

Archelaus of Carrhae (Written in 278 A.D.)

“For the things which we have received from the apostles, we teach, that they may be handed down to others in succession.” –The Acts of the Disputation with Manes, Chapter 9.

Eusebius of Caesarea (260-340 A.D.)

“At that time [A.D. 150] there flourished in the Church Hegesippus, whom we know from what has gone before, and Dionysius, bishop of Corinth, and another bishop, Pinytus of Crete, and besides these, Philip, and Apollinarius, and Melito, and Musanus, and Modestus, and, finally, Irenaeus. From them has come down to us in writing, the sound and orthodox faith received from tradition” (Church History 4:21).

Athanasius of Alexandria (295-373 A.D.)

“Again we write, again keeping to the apostolic traditions, we remind each other when we come together for prayer; and keeping the feast in common, with one mouth we truly give thanks to the Lord” (Festal Letters 2:7 [A.D. 330]).

“But you are blessed, who by faith are in the Church, dwell upon the foundations of the faith, and have full satisfaction, even the highest degree of faith which remains among you unshaken. For it has come down to you from apostolic tradition, and frequently accursed envy has wished to unsettle it, but has not been able” (ibid., 29).

“The Bishops at Nicaea wrote as they did, not as men inventing phrases of them-selves, but as having the witness of the Fathers. Indeed, nearly one hundred and thirty years ago former bishops of Great Rome and of our city wrote and censured those who were saying that the Son was a creature and not of the same substance as the Father.” –Synodal Letter to the Bishops of Africa, Chapter 6 (Written in 360 A.D.)

“Let us note that the very tradition, teaching, and faith of the Catholic Church from the beginning, which the Lord gave, was preached by the Apostles, and preserved by the Fathers.  On this the Church was founded; and if anyone departs from this, he neither is nor should he be called a Christian.” –Four Letters to Serapion of Thmuis 1:28 (Written 359 A.D.)

“The Fathers of the Council of Nicaea wrote.. Thus the Catholic Church believes. And there they confessed how they believed. This they did in order to show that their judgment was not of more recent origin, but was, in fact, of Apostolic times: and that what they wrote was not a discovery of their own, but is simply that which was taught by the Apostles.”  –Letter Concerning the
Councils of Rimini and Seleucia (Written in 361 A.D.)

“In regards to the Word’s eternal coexistence with the Father and that He is not of other substance or essence, as they declared in the Council of Nicaea… we are proving that this same opinion has been handed down from Father to Father.  But you modern
Jews and disciples of Caiphas, how many Fathers can you cite for your phrases? Indeed,
you can not even quote one.” – Letter concerning
Council of Nicaea (Written 350 A.D.)

Epiphanius of Salamis (313-403 A.D.)

“It is needful also to make use of tradition, for not everything can be gotten from sacred Scripture. The holy apostles handed down some things in the scriptures, other things in tradition” (Medicine Chest Against All Heresies 61:6 [A.D. 375]).

Basil “the Great” (330-379 A.D.)

“Of the dogmas and messages preserved in the Church, some we possess from written teaching and others we receive from the tradition of the apostles, handed on to us in mystery. In respect to piety, both are of the same force. No one will contradict any of these, no one, at any rate, who is even moderately versed in matters ecclesiastical. Indeed, were we to try to reject unwritten customs as having no great authority, we would unwittingly injure the gospel in its vitals; or rather, we would reduce [Christian] message to a mere term” (The Holy Spirit 27:66 [A.D. 375]).

“Where is it written that we are to bless the baptismal water, the oil of anointing, or even the one being baptized? Is it not from silent and mystical Tradition? Indeed, in what written word is the anointing with oil even taught? Where does it say that in Baptizing, there is to be triple immersion? Where is it written that we are to renounce Satan and all his works? Does this not come from that mysterious teaching, which our Fathers guarded… In the same way, the Apostles and Fathers who, in the beginning, prescribed the Church’s rites, guarded in secrecy and silence the dignity of the mysteries… This is the reason for our handing on of unwritten precepts and practices: that the knowledge of our dogmas may not be neglected and held in contempt by the multitude through too great a familiarity…” –The Holy Spirit 16 (Written in 375 A.D.)

Gregory of Nyssa (335-395 A.D.)

“Let Eunomius first show, then, that the Church has believed in vain that the Only-Begotten Son truly exists and was not made such through adoption by a Father, who then is falsely so-called… It suffices for the proof of our statement that we have a tradition coming down to us from the Fathers, an inheritance as it were, by succession from the Apostles through the saints who came after them.” –Against Eunomius 3:4 (Written 380 A.D.)

John Chrysostom (347-407 A.D.)

“[Paul commands,] ‘Therefore, brethren, stand fast and hold the traditions which you have been taught, whether by word or by our letter’ [2 Thess. 2:15]. From this it is clear that they did not hand down everything by letter, but there is much also that was not written. Like that which was written, the unwritten too is worthy of belief. So let us regard the tradition of the Church also as worthy of belief. Is it a tradition? Seek no further” (Homilies on Second Thessalonians [A.D. 402]).

Rufinus of Aquileia (344-411 A.D.)

“But before I begin to discuss the meaning of the words, I think it well to mention that in different Churches some additions are found in this article. This is not the case, however, in the Church of the city of Rome; the reason being, as I suppose, that, on the one hand, no heresy has had its origin there, and, on the other, that the ancient custom is there kept up, that those who are going to be baptized should rehearse the Creed publicly, that is, in the audience of the people; the consequence of which is that the ears of those who are already believers will not admit the addition of a single word.” -Commentary on the Apostles’ Creed 3 (Written ca 407-409).

It is this which is promised by the holy Apostle concerning the body: It is sown in corruption, it is raised in incorruption; it is sown in weakness, it is raised in power; it is sown in dishonour, it is raised in glory; it is sown a natural body, it is raised a spiritual body. This is the doctrine which has been handed down to me by those from whom I received holy baptism in the Church of Aquileia; and I think that it is the same which the Apostolic See has by long usage handed down and taught.” -Apology of Rufinus to Anastasius, Bishop of Rome, chap 4 (Written 400 A.D.)

Pope Innocent I (Died 417 A.D.)

“In making inquiry with respect to those things that should be treated with all solicitude by bishops, and especially by a true and just and Catholic Council, by preserving, as you have done, the example of ancient tradition, and by being mindful of ecclesiastical discipline, you have truly strengthened the vigour of our Faith, no less now in consulting us than before in passing sentence.”  –Epistle 29, to the Council of Carthage (In requirendis). Jan 27, 417 AD. Patrologia Latina 33.780)

Augustine of Hippo (354-430 A.D.)

“[T]he custom [of not rebaptizing converts] . . . may be supposed to have had its origin in apostolic tradition, just as there are many things which are observed by the whole Church, and therefore are fairly held to have been enjoined by the apostles, which yet are not mentioned in their writings” (On Baptism, Against the Donatists 5:23[31] [A.D. 400]).

“But the admonition that he [Cyprian] gives us, ‘that we should go back to the fountain, that is, to apostolic tradition, and thence turn the channel of truth to our times,’ is most excellent, and should be followed without hesitation” (ibid., 5:26[37]).

“Perhaps you will read the gospel to me, and will attempt to find there a testimony to Manichæus. But should you meet with a person not yet believing the gospel, how would you reply to him were he to say, I do not believe? For my part, I should not believe the gospel except as moved by the authority of the Catholic Church. So when those on whose authority I have consented to believe in the gospel tell me not to believe in Manichæus, how can I but consent? Take your choice. If you say, Believe the Catholics: their advice to me is to put no faith in you; so that, believing them, I am precluded from believing you—If you say, Do not believe the Catholics: you cannot fairly use the gospel in bringing me to faith in Manichæus; for it was at the command of the Catholics that I believed the gospel;— Again, if you say, You were right in believing the Catholics when they praised the gospel, but wrong in believing their vituperation of Manichæus: do you think me such a fool as to believe or not to believe as you like or dislike, without any reason?” -Augustine of Hippo, Against the Fundamental Epistle of Manichaeus, Chapter 5

“But in regard to those observances which we carefully attend and which the whole world keeps, and which derive not from Scripture but from Tradition, we are given to understand that they are recommended and ordained to be kept, either by the apostles themselves or by plenary [ecumenical] councils, the authority of which is quite vital in the Church” (Letter to Januarius [A.D. 400]).

Pope Celestine I (376-432 A.D.)

“We read that they who heard this at Ephesus, the same place at which your holiness has come together, were called thence. To them therefore to whom this preaching of the faith was known, to them also let your defense of the same faith also be known. Let us show them the constancy of our mind with that reverence which is due to matters of great importance; which things peace has guarded for a long time with pious understanding. Let there be announced by you what things have been preserved intact from the Apostles; for the words of tyrannical opposition are never admitted against the King of Kings, nor can the business of truth be oppressed by falsehood.” –The Letter of Pope Cœlestine to the Synod of Ephesus 17, May 8th,  431 A.D.

John Cassian (360-435 A.D.)

“At that time, therefore, when the perfection of the primitive Church remained unbroken, and was still preserved fresh in the memory by their followers and successors, and when the fervent faith of the few had not yet grown lukewarm by being dispersed among the many, the venerable fathers with watchful care made provision for those to come after them, and met together to discuss what plan should be adopted for the daily worship throughout the whole body of the brethren; that they might hand on to those who should succeed them a legacy of piety and peace that was free from all dispute and dissension, for they were afraid that in regard of the daily services some difference or dispute might arise among those who joined together in the same worship, and at some time or other it might send forth a poisonous root of error or jealousy or schism among those who came after.” -Institutes Book II Chapter 5

“If you were an assertor of the Arian or Sabellian heresy, and did not use your own creed, I would still confute you by the authority of the holy Scriptures; I would confute you by the words of the law itself; I would refute you by the truth of the Creed which has been approved throughout the whole world. I would say that, even if you were void of sense and understanding, yet still you ought at least to follow universal consent: and not to make more of the perverse view of a few wicked men than of the faith of all the Churches: which as it was established by Christ, and handed down by the apostles ought to be regarded as nothing but the voice of the authority of God, which is certainly in possession of the voice and mind of God.” –On the Incarnation of Christ Book VI: Chapter 5 (Written in 429 A.D.) 

“Therefore, if you had been a follower and assertor of Sabellianism or Arianism or any heresy you please, you might shelter yourself under the example of your parents, the teaching of your instructors, the company of those about you, the faith of your creed. I ask, O you heretic, nothing unfair, and nothing hard. As you have been brought up in the Catholic faith, do that which you would do for a wrong belief. Hold fast to the teaching of your parents. Hold fast the faith of the Church: hold fast the truth of the Creed: hold fast the salvation of baptism.” -On the Incarnation of Christ Book VI: Chapter 5 (Written in 429 A.D.)

Cyril of Alexandria (376-404 A.D.)

“Behold, therefore, how we, together with the holy synod which met in great Rome, presided over by the most holy and most reverend brother and fellow-minister, Celestine the Bishop, also testify by this third letter to you, and counsel you to abstain from these mischievous and distorted dogmas, which you hold and teach, and to receive the right faith,
handed down to the churches from the beginning through the holy Apostles and Evangelists, who were eye-witnesses, and ministers of the Word.” –The Third Epistle of Cyril to Nestorius (Written in 430 A.D.)

Vincent of Lerins (Died 445 A.D.)

“We said above, that it has always been the custom of Catholics, and still is, to prove the true faith in these two ways; first by the authority of the Divine Canon, and next by the tradition of the Catholic Church.” –Commontorium 29:76

“I have often then inquired earnestly and attentively of very many men eminent for sanctity and learning, how and by what sure and so to speak universal rule I may be able to distinguish the truth of Catholic faith from the falsehood of heretical pravity; and I have always, and in almost every instance, received an answer to this effect: That whether I or any one else should wish to detect the frauds and avoid the snares of heretics as they rise, and to continue sound and complete in the Catholic faith, we must, the Lord helping, fortify our own belief in two ways; first, by the authority of the Divine Law, and then, by the Tradition of the Catholic Church. But here some one perhaps will ask, Since the canon of Scripture is complete, and sufficient of itself for everything, and more than sufficient, what need is there to join with it the authority of the Church’s interpretation? For this reason — because, owing to the depth of Holy Scripture, all do not accept it in one and the same sense, but one understands its words in one way, another in another; so that it seems to be capable of as many interpretations as there are interpreters. For Novatian expounds it one way, Sabellius another, Donatus another, Arius, Eunomius, Macedonius, another, Photinus, Apollinaris, Priscillian, another, Iovinian, Pelagius, Celestius, another, lastly, Nestorius another. Therefore, it is very necessary, on account of so great intricacies of such various error, that the rule for the right understanding of the prophets and apostles should be framed in accordance with the standard of Ecclesiastical and Catholic interpretation.
[6.] Moreover, in the Catholic Church itself, all possible care must be taken, that we hold that faith which has been believed everywhere, always, by all. For that is truly and in the strictest sense Catholic, which, as the name itself and the reason of the thing declare, comprehends all universally. This rule we shall observe if we follow universality, antiquity, consent. We shall follow universality if we confess 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 manifest were notoriously held by our holy ancestors and fathers; consent, in like manner, if in antiquity itself we adhere to the consentient definitions and determinations of all, or at the least of almost all priests and doctors.” –Commonitoria 2:4-6

“To preach any doctrine therefore to Catholic Christians other than what they have received never was lawful, never is lawful, never will be lawful: and to anathematize those who preach anything other than what has once been received, always was a duty, always is a duty, always will be a duty.” –Commontorium 9:14

“‘Keep the deposit’ (1 Tim 20). What is The deposit? That which has been entrusted to you, not that which you have yourself devised: a matter not of wit, but of learning; not of private adoption, but of public tradition; a matter brought to you, not put forth by you, wherein you are bound to be not an author but a keeper, not a teacher but a disciple, not a leader but a follower. Keep the deposit. Preserve the talent of Catholic Faith inviolate, unadulterate. That which has been entrusted to you, let it continue in your possession, let it be handed on by you.” –Commontorium 22:27

Theodoret of Cyr (393-458 A.D.)

“We are guarding the dogmatic teaching of the Apostles intact even to the present time. Handing this teaching down to us are not only the Apostles and the prophets, but also those whose writings interpret their books, Ignatius, Eustathius, Athanasius, Basil, Gregory, John, and the other lights of the ecumene, and before these the holy Fathers gathered in Nicaea, whose confession of faith we guard inviolate as a paternal inheritance” –Letter to Florentius 89 (Written 449 A.D.)

Severus of Antioch (459-538 A.D.)

“But, that we believe that the very hypostasis of God the Word became incarnate, according to the apostolic tradition of the church that has been handed down from of old, it is superfluous for us to demonstrate by testimonies to those who have once believed in the Gospel, when John who was divine in words beyond the evangelists said, ‘The Word became flesh and came to dwell in us.’” –The Letter Written by Severus to the Emesenes. [512-8.] 

Pope Agatho (Died 681 A.D.)

“[T]he holy Church of God . . . 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, [and possesses that faith that] 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” (Letter read at fourth session of III Constantinople [A.D. 680]).

“To these same commissioners we also have given the witness of some of the holy Fathers, whom this Apostolic Church of Christ receives, together with their books, so that, having obtained from the power of your most benign Christianity the privilege of suggesting, they might out of these endeavour to give satisfaction, (when your imperial Meekness shall have so commanded) as to what this Apostolic Church of Christ, their spiritual mother and the mother of your God-sprung empire, believes and preaches, not in words of worldly eloquence… but that they set forth this tradition of the Apostolic See in all sincerity as it has been taught by the apostolic pontiffs, who were our predecessors.” The Letter of Agatho, Pope of Old Rome, to the Emperor Constantine IV, and the Letter of Agatho and of 125 Bishops of the Roman Synod, Addressed to the Sixth Council

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Non-Catholic Quotes:

J. N. D. Kelly (1909-1997, A Protestant and an early Church historian)

“Where in practice was the apostolic testimony or tradition to be found?… The most obvious answer was that the apostles had committed it orally to the Church, where it had been handed down from generation to generation… Unlike the alleged secret tradition of the Gnostics, it was entirely public and open, having been entrusted by the apostles to their successors, and by these in turn to those who followed them, and was visible in the Church for all who cared to look for it” (Early Christian Doctrines, 37).

For the early Fathers, “the identity of the oral tradition with the original revelation is guaranteed by the unbroken succession of bishops in the great sees going back lineally to the apostles. . . . [A]n additional safeguard is supplied by the Holy Spirit, for the message committed was to the Church, and the Church is the home of the Spirit. Indeed, the Church’s bishops are . . . Spirit-endowed men who have been vouchsafed ‘an infallible charism of truth’” (ibid.).

Georges Florovsky (1893-1979), Russian Orthodox priest, theologian, and historian

“Tradition is not a principle striving to restore the past, using the past as a criterion for the present. Such a conception of tradition is rejected by history itself and by the consciousness of the Orthodox Church. Tradition is the constant abiding of the Spirit and not only the memory of words. Tradition is a charismatic, not a historical event.” –Tradition in the Orthodox Church – Theology – Greek Orthodox Archdiocese of America. www.goarch.org. Retrieved 5 January 2021.

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