Plato, Aristotle and the Church Fathers

Critics of Christianity sometimes say that the Church Fathers turned the simple message of Jesus into Greek philosophy. Some Protestant writers say something similar from the other side: that the early Church let Plato in through the back door. Both charges assume that the Fathers either swallowed Greek philosophy whole or should have refused to touch it.

The record fits neither picture. The Fathers read Plato and Aristotle closely, borrowed their words and tools, and praised what was true in them. They also corrected them, and on several points the Church formally rejected Greek ideas that some Christians had taken over. This article follows that story from St Justin Martyr to St John of Damascus.

In brief

The New Testament warns against philosophy "according to the tradition of men" (Colossians 2:8), yet St Paul quoted Greek poets in Athens (Acts 17:28). The Fathers followed both cues. St Justin Martyr, a convert from Platonism, taught that whatever the philosophers "rightly said" belongs to Christians, while the whole truth is Christ. Clement of Alexandria called philosophy a "schoolmaster" for the Greeks. The Cappadocians used Greek learning "after the manner of bees," and St Basil used philosophical terms to confess the Holy Trinity. St Maximus the Confessor taught that the logoi of creatures exist in the one Logos, and St John of Damascus built on Aristotle's logic. But the Church refused uncreated matter, an eternal world, the pre-existence of souls and transmigration, condemning Origenism in the sixth century and John Italos in 1082.

Thesis: The Fathers did not Hellenize the Gospel; they baptized Greek philosophy, keeping its tools and its true insights while rejecting every Greek doctrine that contradicts creation, the Incarnation and the resurrection.

Athens and Jerusalem in the New Testament

The New Testament gives two signals. St Paul warns the Colossians: "Beware lest anyone cheat you through philosophy and empty deceit, according to the tradition of men, according to the basic principles of the world, and not according to Christ." He tells the Corinthians that "Greeks seek after wisdom; but we preach Christ crucified, to the Jews a stumbling block and to the Greeks foolishness."¹

Yet the same apostle, speaking to philosophers on the Areopagus, quoted a Greek poet: "in Him we live and move and have our being, as also some of your own poets have said, 'For we are also His offspring.'" The moment he spoke of the resurrection of the dead, "some mocked."² Greek thought could recognize something of the one Creator. It could not accept a God who becomes flesh and raises bodies from the grave. And St John's Gospel used a word every educated Greek knew, the Logos, and filled it with new content: "All things were made through Him," and He is "the true Light which gives light to every man coming into the world."³

St Justin Martyr: the philosopher who found the true philosophy

St Justin (died about 165) tells his own story at the start of his Dialogue with Trypho. He tried Stoic, Peripatetic and Pythagorean teachers, then a Platonist, and for a while "the perception of immaterial things quite overpowered me, and the contemplation of ideas furnished my mind with wings, so that in a little while I supposed that I had become wise." Then an old man by the sea questioned him. The old man led him to agree that souls "neither see God nor transmigrate into other bodies," and argued that the soul should not be called immortal by nature, "for if it is immortal, it is plainly unbegotten." Justin replied that it is "both unbegotten and immortal, according to some who are styled Platonists." Justin turned to the prophets and to Christ, and wrote: "I found this philosophy alone to be safe and profitable."⁴ The conversion is itself a correction of Plato: the soul is a creature, given life by God, not a divine being that has always existed.

Justin did not therefore despise what he had studied. In his Second Apology he explains that lawgivers and philosophers spoke well when they contemplated "some part of the Word," but "since they did not know the whole of the Word, which is Christ, they often contradicted themselves." He continues: "For each man spoke well in proportion to the share he had of the spermatic word, seeing what was related to it," and "Whatever things were rightly said among all men, are the property of us Christians."⁵ This is the teaching usually called the "seeds of the Word." In the First Apology he went further, saying that "those who lived reasonably are Christians, even though they have been thought atheists; as, among the Greeks, Socrates and Heraclitus, and men like them."⁶

Two points keep this from becoming the claim that every philosophy saves. First, the "seed" is partial; the whole Word is Christ, who became man. Justin says he strives to be found a Christian "not because the teachings of Plato are different from those of Christ, but because they are not in all respects similar."⁷ Second, Justin explained the truths in Plato partly by borrowing: he claimed that "Plato borrowed" from Moses his account of God shaping the world.⁸ His underlying point stands without that theory: whatever is true anywhere comes from the one Logos.

Uncreated matter: the first clear correction

Justin's own wording about God "having altered matter which was shapeless" shows how easily Platonic ideas could slip into Christian speech. Plato's Timaeus describes a divine Craftsman who, in the words of a standard reference, "imposes mathematical order on a preexistent chaos."⁹ St Theophilus of Antioch, writing later in the second century, saw the problem at once. The Platonists, he wrote, "maintain that matter as well as God is uncreated, and aver that it is coeval with God. But if God is uncreated and matter uncreated, God is no longer, according to the Platonists, the Creator of all things." Against this he set the Church's teaching: "God made all things out of nothing; for nothing was coeval with God."¹⁰

{{very-strong: By the late second century Christian writers were explicitly teaching creation out of nothing against the Platonic doctrine of uncreated matter.}} If matter were eternal, God would be a craftsman working with material He did not make.

Clement of Alexandria and the dissent of Tertullian

In Alexandria, Clement (died about 215) gave the most generous account of Greek philosophy. In the first book of his Stromata he wrote that philosophy "was a schoolmaster to bring the Hellenic mind, as the law, the Hebrews, to Christ," and that it was "a preparation, paving the way for him who is perfected in Christ." He did not mean any one school. He meant whatever had been "well said" by Stoics, Platonists, Epicureans or Aristotelians: "this eclectic whole I call philosophy." And he added a limit: "such conclusions of human reasonings, as men have cut away and falsified, I would never call divine."¹¹ The site's infographic on Clement of Alexandria summarizes his life.

Not every Christian writer agreed. In North Africa, Tertullian blamed philosophy for the heresies of his day and asked the famous question: "What indeed has Athens to do with Jerusalem? What concord is there between the Academy and the Church?"¹² Tertullian himself later joined the Montanist movement. The Church followed neither extreme; it took the path of the Cappadocians.

The Cappadocians: using Greek learning and correcting it

St Basil the Great, St Gregory the Theologian and St Gregory of Nyssa were steeped in Greek learning; Basil and Gregory the Theologian studied together in Athens. They used it without apology. St Gregory the Theologian, in his funeral oration for Basil, defended "even that external culture which many Christians ill-judgingly abhor, as treacherous and dangerous, and keeping us afar from God."¹³

St Basil's Address to Young Men gave the rule of thumb. Christians should read the poets and philosophers as bees visit flowers: "the bees do not visit all the flowers without discrimination, nor indeed do they seek to carry away entire those upon which they light." So, he says, "we, if wise, shall take from heathen books whatever befits us and is allied to the truth, and shall pass over the rest."¹⁴

That rule shows in their theology. To state the faith in the Holy Trinity against the Arians, St Basil used two Greek terms and gave them a precise Christian sense. The distinction between ousia (essence) and hypostasis (person), he wrote, "is the same as that between the general and the particular," so that we confess one essence of the Godhead and three hypostases, Father, Son and Holy Spirit.¹⁵ The vocabulary came from the schools; the faith it expressed came from the baptismal command of Christ (see the Cappadocian Fathers).

The same Fathers corrected the philosophers where they contradicted revelation. In the first homily of his Hexaemeron, St Basil warned his hearers not to suppose, because the heavens move in circles, "that the world has neither beginning nor end," and he asked what use astronomy is to those who "imagine that this visible world is co-eternal with the Creator of all things, with God Himself."¹⁶ St Gregory of Nyssa, in On the Making of Man, devoted a chapter "To those who say that souls existed before bodies," which includes "a refutation of the fables concerning transmigration of souls." His own answer is that "as man is one, the being consisting of soul and body," the beginning of his existence is "one, common to both parts."¹⁷ That is a direct rejection of Plato, whose Socrates argues in the Phaedo that "our souls must have had a prior existence."¹⁸ For the Orthodox view of the person as one being of soul and body, see What Is a Human Being?

Where the Church said no: Origenism, Philoponus and Italos

The pre-existence of souls did not vanish with Gregory's refutation. Origen of Alexandria (died about 254) had speculated that rational beings existed before bodies and fell into them, and later monks developed these ideas into a full system. In the sixth century the Church condemned it. Fifteen anathemas against Origenism, printed with the acts of the Fifth Ecumenical Council (553) in the standard English collection, begin: "If anyone asserts the fabulous pre-existence of souls, and shall assert the monstrous restoration which follows from it: let him be anathema." The sixth anathema condemns the idea that "the most holy and consubstantial Trinity did not create the world" but a lesser "working intelligence," the Platonic Craftsman in Christian dress.¹⁹

{{debated: Whether these fifteen anathemas were passed by the council itself or at a meeting just before it opened is disputed; the leading modern edition of the conciliar decrees leaves them out, saying "recent studies have shown that these anathemas cannot be attributed to this council."}}²⁰ The Orthodox Church's judgement does not hang on that question. The council's own eleventh anathema names Origen among the condemned heretics, and the Council in Trullo (692), in its first canon, confirmed that the fathers of 553 had condemned Origen, Didymus and Evagrius, "all of whom reintroduced feigned Greek myths, and brought back again the circlings of certain bodies and souls," "impiously insulting the resurrection of the dead."²¹ The pre-existence of souls and universal restoration (apokatastasis) are not open opinions in the Orthodox Church; they were rejected. The site's article on Origen treats his legacy in detail.

The eternity of the world was answered with philosophical weapons too. John Philoponus, a Christian scholar in Alexandria, published in 529 a detailed reply to the Neoplatonist Proclus, On the Eternity of the World against Proclus, attacking what a modern scholar calls the "Aristotelian-Neoplatonic" doctrine of an eternal cosmos.²² His later theology was another matter: the Church condemned him after his death, in 680 to 681, for a tritheistic account of the Holy Trinity.

Five centuries later the issue returned in Constantinople. John Italos, who succeeded Michael Psellos as head of the imperial school of philosophy, was condemned by a church synod in 1082. The anathemas against him, included in the Synodikon of Orthodoxy (the liturgical text first composed in the ninth century for the restoration of the icons and read on the Sunday of Orthodoxy), charge that he "taught the transmigration of souls and the eternity of Platonic ideas."²³ How far Italos held these views is debated, since the charges cannot all be matched to his surviving writings. The line the Church drew is not: Greek doctrines that deny creation, the unity of the person, or the resurrection have no place in Christian teaching.

St Maximus the Confessor: the logoi in the Logos

St Maximus (580 to 662) shows the Fathers' method at its most mature. He used the vocabulary of late Neoplatonism, but placed Christ at its center. In the seventh of his Ambigua he teaches that each creature has its logos, its principle, willed by God, and that "the one Logos is many logoi and the many are One."²⁴ The principles of all creatures are held together in the one Word, through whom "all things were made."

This can sound like Plato's eternal Forms, and it is often compared to them. The Orthodox scholar Vladimir Cvetković observes that "In spite of the fact that Maximus uses Neoplatonic vocabulary, these terms often acquire a different meaning and serve different purposes compared with Neoplatonic systems." Fr Maximos Constas goes further: Maximus's doctrine of the logoi, with the incarnate Logos at its center, "is at once a radical critique of Origenism, a tacit dismissal of Dionysian hierarchies, and a comprehensive rethinking of Christian Neoplatonism." It allowed Maximus "to place greater importance than Dionysius had on the role of the divine will in creation."²⁵ For Plato, the Forms are impersonal patterns that exist alongside the Craftsman. For St Maximus, the logoi are the will and intentions of the personal God, who creates freely and becomes man to bring creation to its goal. More on his life is in the article on St Maximus the Confessor.

Aristotle and St John of Damascus

Plato offered the Fathers a vision; Aristotle offered tools. His logic, with its terms for substance and accident, genus and species, was the common grammar of educated argument. The Christological controversies of the fifth to seventh centuries turned on exactly these terms: nature, essence, person, will, energy. To confess that Christ is one Person in two natures, with two natural wills, the Church needed words that held still.

St John of Damascus (about 679 to 749) gathered this work into his Fount of Knowledge. Its first part, the Dialectica or Philosophical Chapters, is a short handbook of definitions. As the Greek Orthodox theologian Stanley Samuel Harakas summarized it, this part is "Based primarily on Aristotle," and "The method used is definitional, by which major terms are defined in brief sections or chapters."²⁶ Only then does John turn to the heresies and the Exact Exposition of the Orthodox Faith. The order is the point: philosophy sharpens language; the apostolic faith is the master. (See St John of Damascus.)

Objections and replies

"The Fathers Hellenized Christianity."

The best-known form of this charge comes from the German Protestant historian Adolf von Harnack: "Dogma in its conception and development is a work of the Greek spirit on the soil of the Gospel."²⁷ It is worth noting what Harnack himself said when critics repeated his line without its ending: "The foolishness of identifying dogma and Greek philosophy never entered my mind."²⁸ On the central points the record runs the other way. Creation out of nothing, a beginning of the world, the soul as a creature, the resurrection of the body, and a God who becomes man and dies on a cross were all foolishness to Greek philosophy, and the Fathers held to every one of them. They borrowed ousia and hypostasis to say what no Greek school had ever said: that one God is Father, Son and Holy Spirit.

"Tertullian was right: Christians should have avoided philosophy."

Refusing philosophy does not free a Christian from it; it leaves his assumptions unexamined. St Paul quoted the poets, and the councils had to answer heretics who argued philosophically. The Fathers' answer was discernment: revelation judges reason, not the reverse. Colossians 2:8 condemns philosophy "according to the tradition of men" and "not according to Christ"; it does not condemn thinking clearly about Christ.

"Justin's 'seeds of the Word' means any religion or philosophy can save."

Justin's point is that partial truths outside the Church come from Christ and point to Him. He left Platonism because it was incomplete and wrong on the soul. The fullness of truth and salvation is in Christ and His Church; the "seeds" are a reason to preach the Gospel to philosophers, not to leave them where they are.

What we can say confidently

• St Justin, Clement of Alexandria and the Cappadocian Fathers studied Greek philosophy and taught that whatever is true in it comes from God and belongs to Christians.
• {{very-strong: The Fathers rejected Platonic uncreated matter and the eternity of the world, teaching creation out of nothing.}}
• St Gregory of Nyssa rejected the pre-existence and transmigration of souls, and the Church condemned Origenist pre-existence and universal restoration in the sixth century, as the Council in Trullo (692) confirmed.
• St Basil gave the terms ousia and hypostasis their settled Christian meaning in teaching on the Holy Trinity.
• The first part of St John of Damascus's Fount of Knowledge draws mainly on Aristotle's logic as a tool for theology.
• A church synod condemned John Italos in 1082, and the anathemas against him reject transmigration and eternal Platonic ideas.

What remains disputed

• Whether the fifteen anathemas against Origenism were passed by the council of 553 itself or just before it (the condemnation of Origenism is not in doubt).
• How much of the later Origenist system goes back to Origen himself.
• How far John Italos actually held the views for which he was condemned.
• How closely St Maximus's logoi resemble or depart from Neoplatonic ideas in detail; scholars weigh his sources differently.

Conclusion

The Fathers treated Greek philosophy as St Basil's bees treated flowers: they took what was true and left what was poison. Where Plato and Aristotle glimpsed the one God, order in nature, or the dignity of reason, the Fathers recognized the work of the Logos who "gives light to every man." Where the philosophers taught uncreated matter, an eternal world, souls without beginning or a cycle of rebirths, the Church said no, in the writings of her saints and the judgements of her councils.

The result was not a Greek religion with Christian names. It was the faith of the apostles, stated with a precision that Greek words made possible and Greek philosophy could never have reached by itself. The Orthodox Church still invites those who love wisdom to the One who is Wisdom in person: "Christ the power of God and the wisdom of God."²⁹ For more of the Fathers in their own words, see the Church Fathers guide.

Notes

1. Colossians 2:8; 1 Corinthians 1:22-23 (NKJV).
2. Acts 17:28, 32 (NKJV).
3. John 1:3, 9 (NKJV).
4. Justin Martyr, Dialogue with Trypho 2, 4, 5, 8, trans. Marcus Dods and George Reith, ANF 1, https://www.newadvent.org/fathers/01281.htm.
5. Justin Martyr, Second Apology 10, 13, trans. Dods and Reith, ANF 1, https://www.newadvent.org/fathers/0127.htm.
6. Justin Martyr, First Apology 46, ANF 1, https://www.newadvent.org/fathers/0126.htm.
7. Justin, Second Apology 13 (see note 5).
8. Justin, First Apology 59 (see note 6).
9. Donald Zeyl and Barbara Sattler, "Plato's Timaeus," Stanford Encyclopedia of Philosophy (rev. 2022), https://plato.stanford.edu/entries/plato-timaeus/.
10. Theophilus of Antioch, To Autolycus 2.4, 2.10, trans. Marcus Dods, ANF 2, https://www.newadvent.org/fathers/02042.htm.
11. Clement of Alexandria, Stromata 1.5, 1.7, trans. William Wilson, ANF 2, https://www.newadvent.org/fathers/02101.htm.
12. Tertullian, Prescription Against Heretics 7, trans. Peter Holmes, ANF 3, https://www.newadvent.org/fathers/0311.htm.
13. Gregory of Nazianzus, Oration 43.11, trans. Charles Gordon Browne and James Edward Swallow, NPNF2 7, https://www.newadvent.org/fathers/310243.htm.
14. Basil the Great, Address to Young Men on the Right Use of Greek Literature 4, trans. Frederick Morgan Padelford (1902), https://www.tertullian.org/fathers/basil_litterature01.htm.
15. Basil the Great, Letter 236.6, trans. Blomfield Jackson, NPNF2 8, https://www.newadvent.org/fathers/3202236.htm.
16. Basil the Great, Hexaemeron 1.3, trans. Blomfield Jackson, NPNF2 8, https://www.newadvent.org/fathers/32011.htm.
17. Gregory of Nyssa, On the Making of Man 28 (title) and 29.1, trans. H. A. Wilson, NPNF2 5, https://www.newadvent.org/fathers/2914.htm.
18. Plato, Phaedo, trans. Benjamin Jowett, Project Gutenberg eBook 1658, https://www.gutenberg.org/ebooks/1658.
19. "The Anathemas Against Origen" 1 and 6, NPNF2 14, ed. Henry Percival, https://www.newadvent.org/fathers/3812.htm.
20. Norman P. Tanner, ed., Decrees of the Ecumenical Councils (1990), introduction to Constantinople II, as reproduced at https://www.papalencyclicals.net/councils/ecum05.htm.
21. Constantinople II, anathema 11 (see notes 19 and 20); Council in Trullo, canon 1, NPNF2 14, https://www.newadvent.org/fathers/3814.htm.
22. Christian Wildberg, "John Philoponus," Stanford Encyclopedia of Philosophy (rev. 2026), https://plato.stanford.edu/entries/philoponus/.
23. András Kraft, "John Italos," Stanford Encyclopedia of Philosophy (2024), https://plato.stanford.edu/entries/john-italos/.
24. Maximus the Confessor, Ambigua 7 (PG 91:1081BC), as quoted in Vladimir Cvetković, "'All in all' (1 Cor 15:28): Aspects of the Unity between God and Creation according to St Maximus the Confessor," Analogia 2 (2017), https://www.analogiajournal.com/article/all-in-all-1-cor-1528-aspects-of-the-unity-between-god-and-creation-according-to-st-maximus-the-confessor/. Cvetković cites Constas's translation, On Difficulties in the Church Fathers: The Ambigua, vol. 1 (Harvard, 2014), 100-101.
25. Cvetković (see note 24); Maximos Constas, "Maximus the Confessor, Dionysius the Areopagite, and the Transformation of Christian Neoplatonism," Analogia 2 (2017), https://www.analogiajournal.com/article/maximus-the-confessor-dionysius-the-areopagite-and-the-transformation-of-christian-neoplatonism/.
26. Stanley Samuel Harakas, "John of Damascus," Encyclopedia of Religion (1987), via https://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/john-damascus.
27. Adolf Harnack, History of Dogma, vol. 1, trans. Neil Buchanan (1894), p. 17, Project Gutenberg eBook 19612, https://www.gutenberg.org/ebooks/19612.
28. Harnack, History of Dogma 1, appended note on the definition (see note 27).
29. 1 Corinthians 1:24 (NKJV).

Bibliography

Primary sources

• The Holy Bible, New King James Version. Nashville: Thomas Nelson, 1982.
• Plato. Phaedo. Trans. Benjamin Jowett. Project Gutenberg.
• Ante-Nicene Fathers, vols. 1-3: Justin Martyr, First Apology, Second Apology, Dialogue with Trypho; Theophilus of Antioch, To Autolycus; Clement of Alexandria, Stromata; Tertullian, Prescription Against Heretics. Buffalo: Christian Literature Publishing Co., 1885.
• Nicene and Post-Nicene Fathers, Second Series, vols. 5, 7, 8, 14: Gregory of Nyssa, On the Making of Man; Gregory of Nazianzus, Oration 43; Basil the Great, Hexaemeron and Letters; The Seven Ecumenical Councils (Constantinople II, Trullo), ed. Henry Percival. 1893-1900.
• Basil the Great. Address to Young Men on the Right Use of Greek Literature. Trans. Frederick Morgan Padelford. Yale Studies in English 15 (1902).
• Tanner, Norman P., ed. Decrees of the Ecumenical Councils. London and Washington: Sheed and Ward and Georgetown University Press, 1990.

Orthodox and patristic scholarship

• Constas, Maximos. "Maximus the Confessor, Dionysius the Areopagite, and the Transformation of Christian Neoplatonism." Analogia 2 (2017).
• Cvetković, Vladimir. "'All in all' (1 Cor 15:28): Aspects of the Unity between God and Creation according to St Maximus the Confessor." Analogia 2 (2017).
• Harakas, Stanley Samuel. "John of Damascus." Encyclopedia of Religion. 1987.

Other scholarship

• Kraft, András. "John Italos." Stanford Encyclopedia of Philosophy, 2024.
• Wildberg, Christian. "John Philoponus." Stanford Encyclopedia of Philosophy, 2003, rev. 2026.
• Zeyl, Donald, and Barbara Sattler. "Plato's Timaeus." Stanford Encyclopedia of Philosophy, 2005, rev. 2022.

Critics of the Fathers' use of philosophy

• Harnack, Adolf. History of Dogma, vol. 1. Trans. Neil Buchanan. London: Williams and Norgate, 1894.