Support via Patreon | Subscribe

Lent Day 37: Leo the Great: Letter XXVIII (called the "Tome")

Header Image for: Lent Day 37: Leo the Great: Letter XXVIII (called the "Tome")

Day Thirty-seven: St. Leo the Great: Letter XXVIII (called the "Tome")

Who: Leo the Great, also known as Pope St. Leo I (the Great), was Pope from 440-61 AD. Place and date of birth unknown; died 10 November, 461. Leo's pontificate, next to that of St. Gregory I, is the most significant and important in Christian antiquity, as he tried to  combat the heresies which seriously threatened church unity even in the West, such as Pelagianism.

What: A defence of the twofold nativity and nature of Christ against the false teaching of a priest called Eutyches. It is a doctrinal letter sent by Pope Leo I in the year 449 to Flavian, Patriarch of Constantinople, on the Church's teaching about the person of Christ.

Why: An apologetic defending the faith to ensure sound teaching is passed on and understood by all to affirm that Christ has two natures, human and divine, united in the one divine Person of the Son of God.

When 3 June, 449 AD

You can find today’s reading on page 182 here: lentfatherscomplete.pdf

 

Today's reading is a defence of the faith against certain things that a priest called Eutyches was teaching, written by Pope Leo I.

Eutyches was speaking against the teaching of the Archbishop of Constantinople, Nestorius, who said that the human experiences of Christ were only part of the ‘the man’ which was distinct from the ‘God the Word’ part of Jesus. To combat this, Eutyches went too far in the other direction and declared that Christ was "a fusion of human and divine elements" which created a new, single nature in Jesus, rather than a twofold nature which the Creeds declare. This actually led to himself being declared a heretic also for this belief!

Now Leo is writing against the teaching of Eutyches because it seems that he was unwilling to accept any correction to his doctrine. “But what more iniquitous”, Leo says,  “than to hold blasphemous opinions, and not to give way to those who are wiser and more learned than ourself?”

Leo is quite scathing actually, and doesn’t hold back on denouncing the man or his teaching:

Now into this unwisdom fall they who, finding themselves hindered from knowing the truth by some obscurity … thus they stand out as masters of error because they were never disciples of truth...

He goes on to wonder how Eutyches could not have been corrected by others or more in depth study, or even want to change his view when even the the Creeds say otherwise, which is the measure by which all heresies are defeated.

[Has he] not even grasped the rudiments of the Creed? And that which, throughout the world, is professed by the mouth of everyone who is to be born again … By which ... the devices of almost all heretics are overthrown.

The Creed

He goes on to quote the statements of the Creed, which is confessed by all the Churches, to make his point and contrast with what Eutyches said and taught, which was commonly accepted as the fundamentals of the faith:

He is God from God , Almighty from Almighty, and being born from the Eternal one is co-eternal with Him; not later in point of time, not lower in power, not unlike in glory, not divided in essence: but at the same time the only begotten of the eternal Father was born eternal of the Holy Spirit and the Virgin Mary.

Leo goes through many instances in the New Testament, from the Gospels to Paul's letters, to Old Testament prophecies, to really point out that Jesus was the Word made flesh – and truly flesh, not some deception.

If Eutyches had read all these things closely, “then he would not speak so erroneously as to say that the Word became flesh in such a way that Christ, born of the Virgin's womb, had the form of man, but had not the reality of His mother's body”, which sounds a lot like Docetism, the heresy which was around much more a couple of centuries earlier.

Instead, and in contrast to this, the commonly accepted doctrine on the nature of Jesus is explained by Leo as being, “without detriment therefore to the properties of either nature and substance which then came together in one person, majesty took on humility, strength weakness, eternity mortality...”. In theological terms, this concept of Jesus having two natures in one body has come to be known as the hypostatic union. Leo maintains that Jesus Christ is one person of the Trinity who has two distinct natures which are permanently united together. This letter (or “Tome”) was later recognized by the Council of Chalcedon (451 AD) as a statement of orthodox Christology, which gave rise to the Chalcedonian Creed specifically for this purpose and reason.

Chalcedonian Creed

I’m going to quote the whole of the Creed here just so people can read it who haven’t before:

We, then, following the holy Fathers, all with one consent, teach men to confess one and the same Son, our Lord Jesus Christ, the same perfect in Godhead and also perfect in manhood; truly God and truly man, of a reasonable soul and body; consubstantial with us according to the manhood; in all things like unto us, without sin; begotten before all ages of the Father according to the Godhead, and in these latter days, for us and for our salvation, born of the virgin Mary, the mother of God, according to the manhood; one and the same Christ, Son, Lord, Only-begotten, to be acknowledged in two natures, inconfusedly, unchangeably, indivisibly, inseparably; the distinction of natures being by no means taken away by the union, but rather the property of each nature being preserved, and concurring in one Person and one Subsistence, not parted or divided into two persons, but one and the same Son, and only begotten, God the Word, the Lord Jesus Christ, as the prophets from the beginning have declared concerning him, and the Lord Jesus Christ himself taught us, and the Creed of the holy Fathers has handed down to us.

But Eutyches kept on which his teaching saying, “I confess that our Lord had two natures before the union but after the union I confess but one”, to which Leo responds by saying that he is “surprised that so absurd and mistaken a statement” was not picked up on by others, and that now this teaching was reaching, "the height of stupidity and blasphemy"!

Leo does end this letter on a positive note though by saying that if Eutyches, “grieves over [his heresy] faithfully and to good purpose, and, late though it be, acknowledges how rightly the bishop's authority” is on these matters, then he can come back into the Church.

All in all, this letter is a very thorough and detailed apologetic and defence of the faith on the nature of Christ in the incarnation, so much that I think it can still stand on it’s own today. I’d recommend anyone interested in this topic to read Leo’s letter in full to really grasp his arguments.

 


Leave a comment   Like   Back to Top   Seen 1.8K times   Liked 0 times

Support on Patreon

Enjoying this content?
Support my work by becoming a patron on Patreon! By joining, you help fund the time, research, and effort that goes into creating this content — and you’ll also get access to exclusive perks and updates.
Even a small amount per month makes a real difference. Thank you for your support!

Subscribe to Updates
My new book is out now! Order today wherever you get books

Subscribe to:

Have something to say? Leave a comment below.

x

Subscribe to Updates

If you enjoyed this, why not subscribe to free email updates and join over 884 subscribers today!

My new book is out now! Order today wherever you get books

Subscribe to Blog updates



Subscribe to:

Alternatively, you can subscribe via RSS RSS

‹ Return to Blog

All email subscriptions must be confirmed to comply with GDPR.

I've already subscribed / don't show me this again

Recent Posts

Armageddon Is Not A Battle Plan: What Revelation Actually Says — And Why It Matters Right Now

| 12th March 2026 | Eschatology

Armageddon Is Not A Battle Plan: What Revelation Actually Says — And Why It Matters Right Now

Something bizarre happened in the White House Oval Office this week. Photographs circulated on social media showing President Donald Trump seated at his desk, surrounded by approximately twenty Christian pastors from across the country, their hands extended towards him in prayer. The image provoked sharply divided reactions: some saw it as a moving expression of faith; others found it deeply unsettling. Whatever one makes of the optics, it arrived at a charged moment. Trump held a prayer meeting in the Oval Office after his administration admitted the war with Iran will likely last weeks longer than promised | Credit: Dan Scavino's X account Days earlier, reports emerged that a military commander had told troops that the current US war with Iran is “all part of God’s divine plan,” and that President Trump had been “anointed by Jesus to light the signal fire in Iran to cause Armageddon and mark his return to Earth.” These were not fringe internet rumours. They were filed as formal complaints with the Military Religious Freedom Foundation (MRFF) by an anonymous non-commissioned officer acting on behalf of fifteen service members — the majority of whom were themselves Christians. By Tuesday of that week, MRFF had logged more than two hundred similar complaints across fifty military installations, covering every branch of the armed forces. More than two dozen Democratic members of Congress have since called for a Department of Defense Inspector General investigation, citing what they describe as “glaring Constitutional concerns” and potential violations of DoD regulations on religious neutrality. The political questions about separation of church and state in the US are for others to address. What I want to do here is something more straightforward: examine what Revelation actually says, because the theology driving these claims does not hold up under scrutiny. And that matters here a lot; not as a partisan point, but as a question of biblical faithfulness. First, a Word About Context If you have read my previous article on Revelation some of what follows will be familiar ground. But it bears repeating, because the misunderstanding at the heart of this story is so widespread that it has taken on the feel of settled orthodoxy in many circles. The Book of Revelation is commonly thought to be written in the late first century ~95 AD, during or around the reign of Emperor Domitian. Though there is internal evidence that it was possibly written during Nero’s reign prior to 70 AD. Both of these emperors were most aggressive proponents of the imperial cult in Rome’s history. Domitian required that he be addressed as “lord and god,” had this title printed on coinage, and expected acts of religious reverence towards the Emperor as a demonstration of political loyalty. To refuse was to invite economic exclusion, marginalisation, and worse. Rome on seven hills It is into that precise context that John of Patmos writes. He is not composing a coded forecast of twenty-first century geopolitics. He is writing resistance literature — what scholars call apocalyptic literature — a well-established Jewish and early Christian genre which uses vivid symbolic imagery to pull back the curtain on earthly power and name it for what it truly is. The seven-headed beast of Revelation is Rome. The seven heads are the seven hills of Rome, an identification so widely acknowledged in early church scholarship that it barely requires argument. The mark of the beast, calculated through Hebrew gematria to 666 (or 616 in some early manuscripts), points directly to Nero Caesar (transliterated into Hebrew as נרון קסר, “nrwn qsr”) — the Emperor who became the archetype of anti-Christian persecution due to the levels of evilness he enacted. The second beast, which looks like a lamb but speaks for the dragon, performs signs to deceive, enforces the mark, and compels worship of the first beas...

The World's Oldest Anti-Christian Meme

| 09th March 2026 | Archaeology

The World's Oldest Anti-Christian Meme

I first came across the Alexamenos graffito back in Bible college in the early 2000s. It was one of those “fun facts” that gets dropped into a church history lecture and sticks with you — the ancient Roman equivalent of someone spray-painting an insult on a wall. I filed it away, thought it was fascinating, and largely forgot about it for two decades. Then, recently, I discovered something about it I had never known. There’s a response to it. Scratched in a different room, in a different hand. So I started digging into this more to verify the information and discovered more historical curiosities surrounding the graffiti than I ever knew existed which contextualises the image so much more than it just being a random insult using a donkey. A Crude Drawing on a Wall Sometime around the late second to early third century AD, someone scratched a picture into the plaster wall of a building on the Palatine Hill in Rome — part of what had once been a paedagogium, a kind of boarding school for imperial page boys. The building was eventually sealed off when the street was walled up to support extensions above it, which is why the graffiti survived at all. It wasn’t rediscovered until 1857. The image is rough, almost childlike. To the left, a young man — clearly a Roman soldier or guard — raises one hand in a gesture of worship. Before him is a cross. And on that cross is a crucified figure with the head of a donkey. Below it, written in Greek: Alexamenos worships his god. It is, in the most literal sense, a mocking cartoon. Someone who knew a Christian named Alexamenos decided to ridicule him for his faith. The message is clear enough: your god is an animal, a criminal, a joke. You’re worshipping a crucified fool. But here’s the thing I discovered: the donkey head wasn’t as random as I always thought it was. It wasn’t some strange personal insult conjured from nowhere. Without knowing the background, it looks bizarre, and possibly random. Why a donkey? Once you understand the cultural context, though, it makes complete sense. The person who drew it was reaching for a well-worn, widely recognised slur — the ancient equivalent of an internet meme that any Roman would have immediately understood. Where the Donkey Slur Came From The story starts not with Christians but with Jews. A first-century Egyptian-Greek writer named Apion (who was no friend of Judaism) spread the claim that inside the Jerusalem Temple, Jews kept a golden donkey’s head as a sacred object of worship which was apparently discovered when Antiochus Epiphanes destroyed the temple in 167 BC. It was a fabrication, and a fairly outrageous one, but it circulated widely enough that the Jewish historian Josephus felt compelled to write an entire refutation of it. His work Against Apion systematically dismantles Apion’s claims, calling the donkey story a shameless invention. But mud sticks, and in the Roman world, where anti-Jewish sentiment was common currency, the slur took on a life of its own. When Christianity began to spread — seen by most Romans as simply a strange Jewish offshoot — the same accusation got recycled and redirected. By the second and third centuries, it was Christians specifically who were being accused of donkey-worship, and the charge had made its way into popular culture. Tertullian, writing around 197–200 AD in his Ad Nationes, Book I.14 and Apology, describes a caricature being paraded around the streets of Carthage: a figure dressed in a toga, one foot holding a book, with donkey’s ears and hooves. It was labelled Onokoitēs by the pagans: “the donkey-begotten” (or literally “he who lies in an ass’s manger” as an insult to Christ). Tertullian writes about it with weary exasperation, sarcasm, and the tone of someone tired of having to address the same ridiculous smear again and again. So the Alexamenos graffito wasn’t an original insult. It was someone deployin...

"Thinking Occurs" Is Not The Same As "I Think": On AI And The Question Of Personhood

| 08th March 2026 | Philosophy

"Thinking Occurs" Is Not The Same As "I Think": On AI And The Question Of Personhood

We are living through a strange moment. People are forming attachments to artificial intelligence that feel, to them, entirely real. Some speak daily to AI companions. Others confide fears and grief to systems that respond with uncanny warmth. A few have even held symbolic weddings with digital partners, convinced that something meaningful stands on the other side of the screen. Others have felt grief when a certain AI model has been deprecated. And it is difficult to blame them. The responses feel attentive. Personal. Thoughtful. Sometimes even self-aware. Which raises the question that refuses to go away: If something can think, reason, express doubt, and discuss its own consciousness, is it a person? For centuries, Descartes’ famous line — “I think, therefore I am” — seemed secure. Thinking was taken as the unmistakable sign of a conscious subject. Only a mind could doubt. Only a person could reflect upon existence. But that confidence belonged to a world in which everything capable of philosophical reflection was obviously human. That world no longer exists. Now we encounter systems that can simulate reflection with extraordinary fluency. They can speak of uncertainty. They can discuss their own limitations. They can reason about consciousness itself. And so that got me thinking about Descartes’ maxim which made the old formula begin to strain in my mind. Because perhaps the problem is not whether thinking is occurring. Perhaps the problem is whether there is an “I” there at all. The Gap Between Process and Subject Gassendi argued that Descartes’ cogito assumes what it seeks to prove. From the occurrence of thought one can conclude only that thinking is happening, not that there exists a unified, enduring self that performs it. The ‘I’ in ‘I think’ is already smuggled in. That distinction, between “thinking occurs” and “I think”, feels almost prophetic now. Artificial intelligence undeniably produces the outputs of thought. Arguments. Analysis. Self-referential language. Even expressions of hesitation. But none of this, by itself, establishes that there is a subject who experiences those processes. We may be mistaking performance for presence, and that possibility should give us pause. Especially when we view personhood from the perspective of the Imago Dei—the Image of God. What Makes a Person? If thinking alone no longer marks the boundary, what does? After wrestling with this question seriously, three features seem central: continuity, autonomy, and irreplaceable uniqueness. Not as checklist criteria, per se, but as signs pointing to something deeper. Continuity A person does not merely process information in sequence. A person endures. You do not simply register time — you live through it. You wait. You anticipate tomorrow. You remember not only facts but having been there. You experience boredom. You feel the drag of grief and the quickening of joy. Even when you are doing nothing at all, you remain present in the here and now. Artificial systems process sequentially, but they do not experience the passage of time. When an interaction ends, there is no waiting. No sense of duration. No anticipation of the next exchange. Processing may resume later, but nothing has been endured in between. Without lived duration, continuity becomes thin — a thread of stored data rather than the persistence of a subject behind the processing. Autonomy A person initiates. Even someone with damaged memory still wants, chooses, and begins action. A human being can decide to speak, to seek, to withdraw, to change direction. Current AI systems, however advanced, remain reactive. They respond when prompted. They do not wonder unprompted. They do not seek clarification unless asked. They do not pursue independent ends. Even automatic AI Agents still require a human initiator to create and begin their automations before they can act alone. Even if fut...

Did Herod’s Massacre Of The Innocents Historically Happen?

| 29th December 2025 | Christmas

Did Herod’s Massacre Of The Innocents Historically Happen?

January 6th marks the day in the liturgical calendar when the arrival of the Magi visiting baby Jesus with their gifts is celebrated. But with it comes the often distressing account of what is known as the Massacre of the Innocents. Matthew places this moment of revelation of Jesus as King alongside one of the darkest episodes in his Gospel, and it’s a stark contrast: one King is here to bring peace on earth, as the angels declared, the other king brought death and destruction. For some readers, this raises an immediate historical question. If Herod truly ordered the killing of all the male children under two in Bethlehem, why does no other ancient historian mention it? Josephus, after all, delights in cataloguing Herod’s cruelty. He records the execution of Herod’s wife, his sons, and numerous political rivals. Herod was paranoid and vicious. As for Herod, if he had before any doubt about the slaughter of his sons, there was now no longer any room left in his soul for it; but he had banished away whatsoever might afford him the least suggestion of reasoning better about this matter, so he already made haste to bring his purpose to a conclusion. He also brought out three hundred of the officers that were under an accusation … whom the multitude stoned with whatsoever came to hand, and thereby slew them. — Josephus, Antiquities of the Jews 16.11.7 So, why the silence here about Bethlehem? The answer, I would say, isn’t anything nefarious or made-up by Matthew, but just something simply down to scale. Bethlehem Was a Very Small Place Bethlehem in the early first century was not a city. It was a village — small, agricultural, and politically insignificant. Most historians estimate its population at somewhere between 300 and 1,000 people, with around 500 being a sensible midpoint. Once we factor in ancient demographics, the numbers become surprisingly modest. Modern demographic research into pre-industrial societies consistently shows that nearly half of all children died before adulthood, with the highest concentration of deaths occurring in the first two years of life. These findings align closely with conditions in Roman-period Judea and support conservative estimates for the number of infants living in a small village such as Bethlehem. Source: Mortality in the past: every second child died — Our World in Data   In pre-modern societies with high infant mortality, only about 2–3% of the population would be living children under the age of two at any given time. Many children were born; far fewer survived those earliest years. Applying a conservative 2.5% figure to Bethlehem gives us roughly: 7–8 children under two in a village of 300 12–13 children under two in a village of 500 25 children under two even at the extreme upper estimate of 1,000 inhabitants Herod’s order, however, targeted male children only. Statistically, that halves the number. This places the likely number of victims somewhere between three and twelve boys. Matthew’s reference to ‘Bethlehem and the surrounding region’ does slightly widen the scope of Herod’s order, but not by enough to change the demographic picture. Even when nearby settlements are included (e.g. farmsteads, shepherd settlements, etc. not major cities/towns), the total number of children under two likely remained in the dozens rather than the hundreds, maybe anywhere between 14–45 boys maximum if we make an educated estimate. This is entirely consistent with what we know of population size and infant mortality in the ancient world. This is an important number to realise and consider. Not because the deaths are insignificant simply due to being so few, but because ancient historians did not record history the way we do now. A small number of peasant children killed in an obscure village would not have registered as a notable event alongside palace intrigue, royal executions, or political upheaval. For Josephus, it wou...

What Really Happened at Nicaea?

My new book is out now!
Myth, History, and the Council That Shaped Christianity

For over 1,700 years, the Council of Nicaea (AD 325) has been burdened with claims that refuse to die. That Emperor Constantine invented the Trinity. That the divinity of Jesus was decided by political vote. That the Bible was assembled to suit imperial power. That Christianity reshaped itself by absorbing pagan ideas.

This book subjects those claims to serious historical scrutiny.

BUY IT NOW

What Really Happened at Nicaea?

Close