Eusebius of Caesarea did not quote pagan writers because he admired pagan religion. He quoted them because he wanted pagan religion condemned by its own witnesses. Yet his method produced an unexpected result: some of the books he used as evidence now survive only in the passages he copied into his Christian apology.

That is the strange history behind many of the Eusebius pagan sources in The Preparation for the Gospel. Eusebius set out to explain why Christians had rejected the ancestral religions of the nations and embraced the God of Israel. To make that case, he filled fifteen books with extracts from Greek historians, Phoenician traditions, pagan theologians, Platonists, Aristotelians, Stoics, skeptics, and one of Christianity’s most capable opponents.

The headline needs one qualification at the beginning. Eusebius did not preserve these works as a modern librarian might preserve a collection without judging it. He selected, arranged, introduced, and sometimes interrupted his sources in order to make an argument, but he also copied enough of them that later readers can hear voices whose books disappeared.

Eusebius wanted the pagans to testify against themselves

The Preparation for the Gospel was the first half of a much larger apologetic project. In this work, Eusebius defended the Christian rejection of Greek and Roman religion and argued that the best features of Greek philosophy had come later than the ancient theology of the Hebrews. In the companion work, The Proof of the Gospel, he argued that the Hebrew Scriptures pointed beyond the Mosaic order to Christ and the nations.

Eusebius knew the obvious objection. Christians had abandoned the gods of their cities, refused the sacrifices that held civic religion together, and claimed the God worshiped by the Jews as their own. Their opponents could dismiss any defense built only from Christian Scripture as a circular appeal to books they did not accept.

His answer was to call hostile witnesses. Near the beginning of The Preparation for the Gospel, he asks where he should obtain the evidence for his argument: “From what source then shall we verify our proofs? Not, of course, from our own Scriptures, lest we should seem to show favour to our argument: but let Greeks themselves appear as our witnesses, both those of them who boast of their philosophy, and those who have investigated the history of other nations.” His answer explains the structure of nearly the entire work.

This was more than a convenient quotation technique. Eusebius wanted to show that Christians had not rejected pagan worship out of ignorance, social resentment, or an unexamined preference for foreign customs. He intended to place the history, theology, rituals, and philosophical defenses of paganism before the reader, then argue that the internal evidence exposed their failure.

Book 3 states the method even more sharply. After reviewing older accounts of the gods, Eusebius turns to the philosophical interpretations used to rescue embarrassing myths. He says that he will “say nothing of ourselves,” but will use the philosophers’ own words so that the secrets of their theology may be learned “from themselves.”

“Since, however, we have once entered upon their refutation, let us go on and consider their interpretations and theories, to see what, after all, they bring with them that is venerable and worthy of the gods; and let us say nothing of ourselves, but on all points make use of their own words, so that we may again learn their venerable secrets from themselves. Now much labour has been spent upon these subjects by numberless other professors of philosophy, who have made different subtle explanations of the same, and strongly insist that the opinion which occurred to each was the exact truth. But for my part I am content to bring forward my proofs from the most illustrious authors who are well known to all philosophers, and have carried off no small reputation for philosophy among the Greeks.”

The sarcasm in “their venerable secrets” should not be missed. Eusebius was not conducting a detached history of religions, and he did not pretend otherwise. He chose recognized pagan authorities because their reputation made them useful witnesses, then used their disagreements and admissions against the religious and philosophical systems he opposed.

Readers who want the larger structure of his argument can begin with the earlier Fresh Ground Theology discussion of Eusebius and the atheistic origins of polytheism. That series traces how he used pagan accounts of origins, the stars, deified rulers, and religious rites to accuse paganism of failing to know the true God. The present question is narrower: what happened to the books he quoted while making that argument?

His apology became an archive

Ancient books disappeared for ordinary reasons as well as dramatic ones. Manuscripts wore out, libraries burned, copying was expensive, tastes changed, and works that no longer found readers stopped being reproduced. A book did not need to be formally condemned in order to vanish; it merely needed several generations of copyists to decide that something else deserved the labor and material.

Quotation could therefore become a form of survival. When one author copied a passage from another, the extract gained a second route through history. The original work might disappear while the quotation lived inside a book that later communities continued to copy.

Eusebius created many such second routes. His purpose was argumentative rather than antiquarian, but his unusually long extracts preserved the wording, sequence, and reasoning of sources that would otherwise be known only by title or reputation. In some cases, even the title would scarcely mean anything to us without the material he supplied.

This does not make every quotation a clear window into the lost original. Eusebius excerpted rather than reproduced whole books, and several passages passed through more than one author before reaching him. The reader must therefore distinguish the words Eusebius quotes, the framing supplied by his immediate source, and Eusebius’s own interpretation of the material.

The distinction is especially necessary with Sanchuniathon. What survives is not a Phoenician manuscript copied directly by Eusebius. It is material presented by Philo of Byblos as the work of Sanchuniathon, quoted and discussed by Eusebius, with Porphyry sometimes brought in as a witness to its antiquity and credibility.

Philo of Byblos and the lost Phoenician history of Sanchuniathon

In Books 1.9–10, Eusebius turns from the earliest worship of the heavenly bodies to the religion of the Phoenicians. He introduces Sanchuniathon as an ancient Phoenician historian whose work Philo of Byblos had rendered into Greek. Eusebius then does something characteristic: before quoting Philo, he calls Porphyry, the anti-Christian philosopher, to confirm the source he is about to use.

“Of the affairs of the Jews the truest history, because the most in accordance with their places and names, is that of Sanchuniathon of Berytus, who received the records from Hierombalus the priest of the god Ieuo; he dedicated his history to Abibalus king of Berytus, and was approved by him and by the investigators of truth in his time. Now the times of these men fall even before the date of the Trojan war, and approach nearly to the times of Moses, as is shown by the successions of the kings of Phoenicia. And Sanchuniathon, who made a complete collection of ancient history from the records in the various cities and from the registers in the temples, and wrote in the Phoenician language with a love of truth, lived in the reign of Semiramis, the queen of the Assyrians, who is recorded to have lived before the Trojan war or in those very times.”

Porphyry’s endorsement served Eusebius twice. It supported the antiquity of the Phoenician account, which Eusebius wanted to place near the age of Moses, and it prevented a pagan reader from dismissing Sanchuniathon as a Christian invention. The defender of pagan religion had vouched for the very witness Eusebius would use against pagan religion.

Philo’s preface presents Sanchuniathon as a researcher who searched temple records and older writings in order to recover events hidden beneath later myths. According to this account, later religious writers had converted human history into allegory, attached it to the cosmos, and covered it with mysteries. Sanchuniathon supposedly worked backward through those layers to recover what had happened.

The most famous passage is the Phoenician account of the beginning of the world. Its vocabulary is strange, and Eusebius immediately judges it as atheistic because it explains the origin of the cosmos without the transcendent Creator. Yet the quotation itself gives us a piece of Phoenician cosmogony that would otherwise be lost:

“The first principle of the universe he supposes to have been air dark with cloud and wind, or rather a blast of cloudy air, and a turbid chaos dark as Erebus; and these were boundless and for long ages had no limit. But when the wind, says he, became enamoured of its own parents, and a mixture took place, that connexion was called Desire. This was the beginning of the creation of all things: but the wind itself had no knowledge of its own creation. From its connexion Mot was produced, which some say is mud, and others a putrescence of watery compound; and out of this came every germ of creation, and the generation of the universe.”

Eusebius did not stop with the cosmogony. He preserved stories about the deification of benefactors, the discovery of food, fire, huts, clothing, navigation, hunting, fishing, metalwork, and religious rites. In the sequence presented by Philo, human beings who discovered useful arts were honored after death, their names were attached to cosmic powers, and historical memory hardened into mythology.

That material suited Eusebius’s argument almost perfectly. He wanted to prove that the pagan gods were neither the eternal God nor worthy subordinate powers, but mortal beings, natural forces, and later inventions. His earlier discussion of the development of the Phoenician, Egyptian, and Greek gods follows this same line of reasoning from the passages he preserved.

Modern readers must be more restrained than Eusebius was about the age and authorship of the material. Scholars continue to debate how much of the account reflects old Phoenician tradition, how much belongs to Philo’s own intellectual world, and whether “Sanchuniathon” represents a recoverable ancient author in the form Philo claims. The later discovery of Northwest Semitic material has made it harder to dismiss the whole account as free invention, but resemblance does not settle every question of date, source, or transmission.

The safe conclusion is still remarkable. Eusebius preserves extensive portions of a Phoenician history associated with Philo of Byblos and Sanchuniathon, and no complete copy of that history survives independently. He meant to expose the human origins of pagan gods, but he also became one of the principal witnesses to Phoenician religious tradition.

Porphyry, the enemy Eusebius kept quoting

Porphyry presents the sharpest form of the paradox. He was not merely a pagan author whose work could be turned against popular religion. He was a learned Platonist who wrote Against the Christians, challenged Christian interpretation of Scripture, and represented the kind of educated opposition Eusebius most needed to answer.

Eusebius nevertheless quotes Porphyry throughout The Preparation for the Gospel. Sometimes Porphyry supplies information about pagan rites and theology, while elsewhere he criticizes other philosophical schools. His writings could be used as hostile testimony because he could hardly be accused of arranging the evidence for Christian advantage.

Book 5.10 preserves part of Porphyry’s Letter to Anebo, a series of questions about Egyptian religion, theurgy, sacrifice, and the invocation of divine beings. Porphyry presses a problem that Eusebius was eager to exploit: if the gods are superior, pure, and just, why can ritual specialists command them, attract them with sacrificial fumes, or threaten them into compliance? Porphyry writes:

“But what utterly perplexes me is, how, though invoked as superiors, they receive orders as inferiors, and while requiring their worshipper to be just, submit when bidden themselves to do injustice; and, while they would not listen to one who invokes them, if defiled by sensual pleasure, do not hesitate themselves to lead any whom they meet into lawless indulgence. They also give orders that their interpreters must be abstainers from animal food, that they may not be tainted with the vapours from the carcases, though they are themselves mightily allured by the vapours from the sacrifices; also that the initiate must not touch a dead body, though it is by means of dead animals that the gods are for the most part brought down. But much more absurd than this is the notion that a man under the power of any ordinary master should employ threats, not merely to a daemon perchance or to a dead man’s soul, but to the royal Sun himself, or the Moon, or any of the deities in heaven, and try to frighten them by lies, in order that they may speak the truth.”

Porphyry continues by asking how a human magician could threaten the sun, moon, or heavenly gods with fantastic acts of violence and disclosure. Either the rituals were human frauds, he argues, or the theology behind them attributed to the gods conditions unworthy of deity. Eusebius takes Porphyry’s questions as an internal confession that the beings contacted through pagan ritual were neither the highest God nor good divine powers.

The agreement between the two men should not be exaggerated. Porphyry’s questions belong to a pagan philosophical debate about ritual and divine nature, while Eusebius inserts them into a Christian argument about demons and false worship. Porphyry did not become a Christian witness simply because one part of his criticism could be made to serve a Christian conclusion.

Yet Eusebius let the criticism stand in Porphyry’s own words. He could have summarized the objection in a sentence and moved on, but he copied the questions and preserved their force. A Christian author thereby became a major conduit for the work of a philosopher remembered as one of Christianity’s most formidable ancient critics.

The irony is even stronger because Eusebius does not hide Porphyry’s hostility. In Book 1 he refers plainly to the philosopher’s work against Christians, then quotes it when it can establish the credentials of Sanchuniathon. Porphyry’s opposition made him dangerous, but it also made his testimony useful.

Aristocles preserved the skeptics, and Eusebius preserved Aristocles

By Books 14–15, Eusebius has moved far beyond stories about scandalous gods and strange rites. He is comparing philosophical schools, first principles, knowledge, the soul, matter, providence, and the nature of God. The argument still aims at Christian apologetics, but the surviving material is now valuable for the history of philosophy.

Aristocles of Messene was a Peripatetic philosopher who wrote a work commonly called On Philosophy. The work itself is lost, but Eusebius preserves substantial extracts from its later books. These passages contain Aristocles’s accounts and criticisms of earlier philosophical schools, including Eleatics, Cyrenaics, Epicureans, and skeptics.

The best-known passage concerns Pyrrho and the tradition that developed from him. Pyrrho left no writings, which means that later reports are necessary for any reconstruction of his thought. Eusebius quotes Aristocles, Aristocles reports Timon, and Timon had been a disciple and admirer of Pyrrho.

“Pyrrho indeed, of Elis, spoke strongly in this sense, but has not himself left anything in writing. But his disciple Timon says that the man who means to be happy must look to these three things: first, what are the natural qualities of things; secondly, in what way we should be disposed towards them; and lastly, what advantage there will be to those who are so disposed. The things themselves then, he professes to show, are equally indifferent, and unstable, and indeterminate, and therefore neither our senses nor our opinions are either true or false. For this reason then we must not trust them, but be without opinions, and without bias, and without wavering, saying of every single thing that it no more is than is not, or both is and is not, or neither is nor is not.”

Eusebius did not quote this passage to recommend skepticism. Aristocles follows it with objections, and Eusebius uses the entire dispute to demonstrate the contradictions and uncertainty of the Greek schools. Nevertheless, without this hostile chain of transmission, one of the central reports about early Pyrrhonism would be missing.

The passage therefore requires the same care as the Sanchuniathon material. It is evidence for Pyrrho, but it is not Pyrrho speaking directly. It is Timon as reported by Aristocles, selected by Eusebius within a refutation of Greek philosophy.

Once those layers are acknowledged, the value of the passage becomes clearer rather than weaker. Ancient philosophical traditions often survive through opponents who preserved a position in order to answer it. The historian must account for the hostile frame, but hostility does not erase the wording that the hostile author chose to copy.

Numenius survived in Christian argument

Numenius of Apamea was a second-century Platonist with strong Pythagorean interests. He sought the older sources of Platonic truth and compared Greek philosophy with the traditions of other nations, including Jews, Egyptians, Magi, and Brahmins. Later Platonists knew his work, but his books no longer survive intact.

Eusebius found Numenius especially useful because Numenius could speak of an incorporeal reality above the material world and could be brought into conversation with Hebrew theology. Yet Eusebius did not merely quote a slogan about Plato and Moses. In Book 15.17, he preserves an extended philosophical argument from the first book of Numenius’s On the Good.

“But what then is ‘being’? Is it these four elements, earth and fire and the other two intermediate natures? Are then these the real beings, either collectively, or any one of them singly? But how can they be, since they are both created and destroyed again, for we may see them proceeding one out of another, and interchanging, and subsisting neither as elements nor as compounds? These cannot thus be a body with true being. But though not these, yet it is possible that matter may have true being? But for matter also this is utterly impossible, through want of power to continue. For matter is a running and swiftly changing stream, in depth, and breadth, and length undefined and endless.”

Numenius continues by arguing that changing matter cannot possess true being and that bodies require something stable to hold them together. His conclusion moves toward the priority of the incorporeal, which is neither generated nor subject to bodily change. Eusebius employs that argument against materialist accounts of God and the world.

Here again, agreement has limits. Numenius was not setting out Nicene theology before Nicaea, and Eusebius did not mistake him for a Christian. He treated pagan philosophy as divided, late, and dependent, yet he was willing to say that some philosophers had perceived real features of God and reality more accurately than others.

This discrimination is easy to miss if Eusebius is described only as a man who attacked pagan thought. He did attack it, sometimes with considerable severity, but his argument required him to rank pagan positions rather than dismiss them all as equally false. Numenius could therefore appear as a witness against Stoic materialism even while remaining part of the Greek philosophical world Eusebius placed below the Hebrew prophets.

The books are preserved, but they are not untouched

Calling Eusebius “the bishop who saved pagan books” is defensible if “saved” describes the historical result. It becomes misleading if it suggests that his governing purpose was neutral preservation. His purpose was to defend Christianity, explain Christian separation from pagan worship, and argue for the priority and superiority of Hebrew theology.

The first limitation is selection. Eusebius chose passages that advanced his case, which means that the surviving fragments may overrepresent contradictions, embarrassments, concessions, and statements compatible with his own argument. We usually do not possess the missing context needed to measure the excerpt against the balance of the original work.

The second limitation is mediation. The Sanchuniathon material passes through Philo of Byblos, and the report about Pyrrho passes through Timon and Aristocles. Each writer had his own questions, vocabulary, and argumentative purpose before Eusebius made the final selection.

The third limitation is framing. Eusebius tells the reader how a passage should be understood, and his comments can be more sweeping than the passage itself warrants. The survival of a quotation does not require us to accept the conclusion he draws from it.

These cautions do not reduce The Preparation for the Gospel to propaganda that can be mined only after distrusting every line. Eusebius frequently names his source, identifies the work or book, marks the beginning and end of an extract, and quotes enough material for the reader to follow an argument. Sabrina Inowlocki’s study of his citation technique and Aaron Johnson’s study of the argument of the Preparation both show why the quotations must be read as deliberate parts of an apology, but deliberate use is not the same thing as wholesale invention.

The better approach is neither credulity nor reflexive suspicion. Eusebius should be read as a partisan author who often gives his opponents enough room to speak at length. His arrangement belongs to him, while the preserved words remain evidence that must be judged according to their particular chain of transmission.

A Christian did not need to fear a pagan book

There is also a theological habit visible in Eusebius’s method. He believed pagan religion was false and pagan philosophy was deeply divided, but he did not think the Christian case became stronger by pretending that pagan authors had said nothing intelligent. He read them, distinguished among them, quoted them, and made the argument in public.

That approach differs from a shallow search for agreeable quotations. Eusebius was not collecting ancient statements that sounded vaguely biblical so that he could pronounce everyone secretly Christian. He used pagan authors as witnesses with limited competence: one could preserve an old tradition, expose a contradiction, criticize a rival school, or reach a true conclusion about incorporeal reality without possessing the gospel.

It also differs from the fear that reading a hostile author grants him too much power. Porphyry had attacked Christianity directly, yet Eusebius read him closely enough to use his historical claims and philosophical criticisms. The answer to a serious opponent was not to erase his books from the argument, but to understand what he had actually written.

Fresh Ground Theology has already explored how Eusebius used ancient traditions in asking about the origin of the gods. The further lesson here concerns the handling of sources. A Christian scholar can reject a system, recognize truth within a particular argument, preserve the evidence, and state precisely where the disagreement lies.

The irony should therefore remain an irony. Eusebius wanted to defeat pagan religion and subordinate Greek philosophy to the older wisdom of the Hebrews. He accomplished part of that project by constructing a library of pagan testimony inside a Christian book.

Centuries later, many readers come to The Preparation for the Gospel for the witnesses rather than the verdict. They read Philo’s Phoenician history, Porphyry’s questions, Aristocles’s account of skepticism, and Numenius’s argument about being because Eusebius chose not merely to name his opponents, but to quote them. The refutation survived, and inside it the books he opposed survived with it.

Sources and further reading

The primary passages cited above may be read in E. H. Gifford’s complete online edition of The Preparation for the Gospel. For philosophical context, see the Stanford Encyclopedia of Philosophy entries on ancient skepticism and Numenius. These three resources provide the primary text and concise orientation to the two philosophical traditions most likely to be unfamiliar to general readers.

For print research, see E. H. Gifford, Eusebii Pamphili Evangelicae Praeparationis Libri XV; Aaron P. Johnson, Ethnicity and Argument in Eusebius’ Praeparatio Evangelica; Sabrina Inowlocki, Eusebius and the Jewish Authors: His Citation Technique in an Apologetic Context; Andrew James Carriker, The Library of Eusebius of Caesarea; Harold W. Attridge and Robert A. Oden Jr., Philo of Byblos: The Phoenician History; Maria Lorenza Chiesara, Aristocles of Messene: Testimonia and Fragments; and Robert Petty, The Fragments of Numenius of Apamea. These works address Eusebius’s argument, source use, library, and the particular fragmentary authors discussed here.