Arius was arguably the most notorious heretic of the early church.

Though Arius’ heretical views were soundly condemned by the Council of Nicaea (in A.D. 325), the controversy he sparked raged for another fifty years throughout the Roman Empire. During those tumultuous decades, the defenders of Trinitarian orthodoxy often found themselves outnumbered and out of favor with the imperial court. Yet they refused to compromise.

Among them, most famously, stood Athanasius of Alexandria—exiled on five different occasions for his unwavering commitment to the truth. He was joined by the Cappadocian Fathers: Basil of Caesarea, Gregory of Nazianzas, and Gregory of Nyssa.

But how did these early Christian leaders know that the doctrine they were defending was, in fact, a truth worth fighting for? How did they know that they were right and the Arians were wrong? Was it on the basis of oral tradition, a previous church council, or an edict from the bishop of Rome?

No.

They defended the truth by appealing to the Scriptures.

Gregory of Nyssa makes that point explicit in a letter to Eustathius. The Arians claimed that their tradition (or “custom”) did not allow for the Trinitarian position. Gregory responded with the following:

What then is our reply? We do not think that it is right to make their prevailing custom the law and rule of sound doctrine. For if custom is to avail for proof of soundness, we too, surely, may advance our prevailing custom; and if they reject this, we are surely not bound to follow theirs. Let the inspired Scripture, then, be our umpire, and the vote of truth will surely be given to those whose dogmas are found to agree with the Divine words. (Dogmatic Treatises, Book 12. On the Trinity, To Eustathius.)

When Arian custom ran contrary to Trinitarian custom, to what authority did Gregory appeal? The Scriptures.

As Gregory rightly understood, Scripture is a higher authority than tradition. That is why he appealed to the Word of God as the final arbiter in the debate over Arianism.

In so doing, Gregory provides a vivid illustration of the principle of sola Scriptura, twelve centuries before the Reformation. Of course, Gregory was not the only church father who shared in that conviction.

Here is a short list of eight other church fathers who shared Gregory’s perspective on the authority of Scripture. (Many more similar citations could be added to this list, but this is more than enough for a single blog post.)

1. Irenaeus of Lyons (d. 202)

We have learned from none others the plan of our salvation, than from those through whom the Gospel has come down to us, which they did at one time proclaim in public, and, at a later period, by the will of God, handed down to us in the Scriptures, to be the ground and pillar of our faith. (Against Heresies, 3.1.1)

2. Tertullian of Carthage (c. 160–235) [in defending the truth of the Trinity against the heretic Praxeas:]

It will be your duty, however, to adduce your proofs out of the Scriptures as plainly as we do, when we prove that He made His Word a Son to Himself. . . . All the Scriptures attest the clear existence of, and distinction in (the Persons of) the Trinity, and indeed furnish us with our Rule of faith. (Against Praxeas, 11)

3. Hippolytus (d. 235)

There is, brethren, one God, the knowledge of whom we gain from the Holy Scriptures, and from no other source. For just as a man if he wishes to be skilled in the wisdom of this world will find himself unable to get at it in any other way than by mastering the dogmas of philosophers, so all of us who wish to practice piety will be unable to learn its practice from any quarter than the oracles of God. Whatever things then the Holy Scriptures declare, at these let us look; and whatsoever things they teach these let us learn. (Against Heresies, 9)

4. Eusebius of Caesarea (263–339)

What they [the heretics] say might be plausible, if first of all the Divine Scriptures did not contradict them. . . . They have treated the Divine Scriptures recklessly and without fear. They have set aside the rule of ancient faith; and Christ they have not known. They do not endeavor to learn what the Divine Scriptures declare, but strive laboriously after any form of syllogism which may be devised to sustain their impiety. And if any one brings before them a passage of Divine Scripture, they see whether a conjunctive or disjunctive form of syllogism can be made from it. And as being of the earth and speaking of the earth, and as ignorant of him who cometh from above, they forsake the holy writings of God to devote themselves to geometry. Euclid is laboriously measured by some of them; and Aristotle and Theophrastus are admired; and Galen, perhaps, by some is even worshiped. But that those who use the arts of unbelievers for their heretical opinions and adulterate the simple faith of the Divine Scriptures by the craft of the godless are far from the faith, what need is there to say? (Church History, 5.28.4, 13–15)

5. Athanasius of Alexandria (296–373) [After outlining the books of the Bible, Athanasius wrote:]

These are fountains of salvation, that they who thirst may be satisfied with the living words they contain. In these alone is proclaimed the doctrine of godliness. Let no man add to these, neither let him take ought from these. For concerning these the Lord put to shame the Sadducees, and said, ‘Ye do err, not knowing the Scriptures.’ And He reproved the Jews, saying, ‘Search the Scriptures, for these are they that testify of Me.’ (Festal Letter 39, 6–7)

6. Cyril of Jerusalem (315–386) [After defending the doctrine of the Holy Spirit]:

We ought not to deliver even the most casual remark without the Holy Scriptures: nor be drawn aside by mere probabilities and the artifices of argument. Do not then believe me because I tell thee these things, unless thou receive from the Holy Scriptures the proof of what is set forth: for this salvation, which is of our faith, is not by ingenious reasonings, but by proof from the Holy Scriptures…Let us then speak nothing concerning the Holy Ghost but what is written; and if anything be not written, let us not busy ourselves about it. The Holy Ghost Himself spoke the Scriptures; He has also spoken concerning Himself as much as He pleased, or as much as we could receive. Be those things therefore spoken, which He has said; for whatsoever He has not said, we dare not say. (Catechetical Lectures, 4.17ff)

7. John Chrysostom (344–407)

Let us not therefore carry about the notions of the many, but examine into the facts. For how is it not absurd that in respect to money, indeed, we do not trust to others, but refer this to figures and calculation; but in calculating upon facts we are lightly drawn aside by the notions of others; and that too, though we possess an exact balance, and square and rule for all things, the declaration of the divine laws? Wherefore I exhort and entreat you all, disregard what this man and that man thinks about these things, and inquire from the Scriptures all these things; and having learnt what are the true riches, let us pursue after them that we may obtain also the eternal good things; which may we all obtain, through the grace and love towards men of our Lord Jesus Christ, with Whom, to the Father and the Holy Spirit, be glory, might, and honor, now and ever, and world without end. Amen.” (Homily on 2 Corinthians, 13.4)

8. Augustine of Hippo (354–430)

Whereas, therefore, in every question, which relates to life and conduct, not only teaching, but exhortation also is necessary; in order that by teaching we may know what is to be done, and by exhortation may be incited not to think it irksome to do what we already know is to be done; what more can I teach you, than what we read in the Apostle? For holy Scripture establishes a rule to our teaching, that we dare not “be wiser than we ought;” but be wise, as he himself says, “unto soberness, according as unto each God hath allotted the measure of faith.” Be it not therefore for me to teach you any other thing, save to expound to you the words of the Teacher, and to treat of them as the Lord shall have given to me. (The Good of Widowhood, 2)

Augustine (again) [Noting that Scripture ought to be interpreted through the lens of other Scripture]

In all these books those who fear God and are of a meek and pious disposition seek the will of God. And in pursuing this search the first rule to be observed is, as I said, to know these books, if not yet with the understanding, still to read them so as to commit them to memory, or at least so as not to remain wholly ignorant of them. Next, those matters that are plainly laid down in them, whether rules of life or rules of faith, are to be searched into more carefully and more diligently; and the more of these a man discovers, the more capacious does his understanding become. For among the things that are plainly laid down in Scripture are to be found all matters that concern faith and the manner of life, —to wit, hope and love, of which I have spoken in the previous book. After this, when we have made ourselves to a certain extent familiar with the language of Scripture, we may proceed to open up and investigate the obscure passages, and in doing so draw examples from the plainer expressions to throw light upon the more obscure, and use the evidence of passages about which there is no doubt to remove all hesitation in regard to the doubtful passages. (On Christian Doctrine, 2.9)

Clearly, the doctrine of sola Scriptura was championed by Christian leaders long before the Reformation.

Those interested in studying this topic in more detail will benefit from William Webster’s in-depth treatment, found here.