The Rock — Gospel — study.xeb.ai

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The Question

Twelve words in Greek — σὺ εἶ Πέτρος καὶ ἐπὶ ταύτῃ τῇ πέτρᾳ οἰκοδομήσω μου τὴν ἐκκλησίαν — carry more institutional weight than any other sentence Jesus is recorded as saying. They are cut in letters six feet high around the interior dome of St Peter's in Rome. A dogmatic constitution of 1870 rests the papal office on them and anathematises those who read them otherwise. And a great many Christians have read them to mean something else entirely: that the rock is not the man at all, but the confession he had just made, or the Christ he had just confessed.

So the question is worth asking carefully, and it is really three questions wearing one coat. First: what does ταύτῃ τῇ πέτρᾳ — “this rock” — point at? Second: does the Greek settle it? Third: even if the rock is Peter, what follows about anyone who comes after him?

Those three come apart under pressure, and most of the heat in the argument comes from running them together. It is entirely coherent to hold that the rock is Peter personally and that nothing whatever follows about bishops of Rome — that is Tertullian's position, in the year 220, and he says so with some asperity. It is equally coherent to hold that the rock is the confession and still grant Peter a real primacy among the Twelve — that is roughly Calvin's. This page keeps the three questions apart, states each reading in its strongest form, and lets ten Fathers speak in their own words.

It does not reach a verdict. It does report, precisely, where the Greek stops being able to help — which turns out to be earlier than partisans on both sides tend to admit.

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The Place

Matthew places the exchange with unusual care, and the setting is not decoration.

Caesarea Philippi is modern Banias, at the southern foot of Mount Hermon, some twenty-five miles north of the Sea of Galilee and outside Herod Antipas' jurisdiction. A spring bursts out of a cave at the base of a sheer cliff face and feeds one of the headwaters of the Jordan. The cave was sacred to Pan — the place was called Paneas — and the cliff above it is cut with votive niches. Herod the Great built a temple of white marble there to Caesar Augustus; his son Philip the Tetrarch enlarged the city and renamed it for Caesar and for himself.

So Jesus asks “who do people say that I am?” standing in front of a rock face dedicated to a god of the wild and a temple dedicated to a man who was called divi filius, son of the deified. Peter answers that this man is the Son of the living God. Then Jesus speaks about a rock, and about gates.

It is often said — in sermons more than in commentaries — that the cave mouth at Banias was known locally as “the gates of Hades,” and that Jesus was pointing at it. That is a proposal, and an attractive one: Greek and Roman cult did associate such chasms with the underworld. But no ancient source calls the Paneion by that name, and πύλαι ᾅδου is a standing Jewish idiom for death and the grave, found in Isaiah 38:10, Job 38:17 and Wisdom 16:13 without any cave in view. The setting may well be in Matthew's mind. It is not evidence, and this page does not lean on it.

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The Text

8 versesKJV · ASV · WEB · BSB

SBLGNT

13Ἐλθὼν δὲ ὁ Ἰησοῦς εἰς τὰ μέρη Καισαρείας τῆς Φιλίππου ἠρώτα τοὺς μαθητὰς αὐτοῦ λέγων· Τίνα λέγουσιν οἱ ἄνθρωποι εἶναι τὸν υἱὸν τοῦ ἀνθρώπου; 14οἱ δὲ εἶπαν· Οἱ μὲν Ἰωάννην τὸν βαπτιστήν, ἄλλοι δὲ Ἠλίαν, ἕτεροι δὲ Ἰερεμίαν ἢ ἕνα τῶν προφητῶν. 15λέγει αὐτοῖς· Ὑμεῖς δὲ τίνα με λέγετε εἶναι; 16ἀποκριθεὶς δὲ Σίμων Πέτρος εἶπεν· Σὺ εἶ ὁ χριστὸς ὁ υἱὸς τοῦ θεοῦ τοῦ ζῶντος. 17ἀποκριθεὶς δὲ ὁ Ἰησοῦς εἶπεν αὐτῷ· Μακάριος εἶ, Σίμων Βαριωνᾶ, ὅτι σὰρξ καὶ αἷμα οὐκ ἀπεκάλυψέν σοι ἀλλ’ ὁ πατήρ μου ὁ ἐν τοῖς οὐρανοῖς· 18κἀγὼ δέ σοι λέγω ὅτι σὺ εἶ Πέτρος, καὶ ἐπὶ ταύτῃ τῇ πέτρᾳ οἰκοδομήσω μου τὴν ἐκκλησίαν, καὶ πύλαι ᾅδου οὐ κατισχύσουσιν αὐτῆς· 19δώσω σοι τὰς κλεῖδας τῆς βασιλείας τῶν οὐρανῶν, καὶ ὃ ἐὰν δήσῃς ἐπὶ τῆς γῆς ἔσται δεδεμένον ἐν τοῖς οὐρανοῖς, καὶ ὃ ἐὰν λύσῃς ἐπὶ τῆς γῆς ἔσται λελυμένον ἐν τοῖς οὐρανοῖς. 20τότε διεστείλατο τοῖς μαθηταῖς ἵνα μηδενὶ εἴπωσιν ὅτι αὐτός ἐστιν ὁ χριστός.

World English Bible

13Now when Jesus came into the parts of Caesarea Philippi, he asked his disciples, saying, “Who do men say that I, the Son of Man, am?” 14They said, “Some say John the Baptizer, some, Elijah, and others, Jeremiah or one of the prophets.” 15He said to them, “But who do you say that I am?” 16Simon Peter answered, “You are the Christ, the Son of the living God.” 17Jesus answered him, “Blessed are you, Simon Bar Jonah, for flesh and blood has not revealed this to you, but my Father who is in heaven. 18I also tell you that you are Peter, and on this rock I will build my assembly, and the gates of Hades will not prevail against it. 19I will give to you the keys of the Kingdom of Heaven, and whatever you bind on earth will have been bound in heaven; and whatever you release on earth will have been released in heaven.” 20Then he commanded the disciples that they should tell no one that he was Jesus the Christ.

The pivot — Matthew 16:17–19 in four translations

Verse	King James (1611)	American Standard (1901)	World English	Berean Standard
16:17	And Jesus answered and said unto him, Blessed art thou, Simon Barjona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven.	And Jesus answered and said unto him, Blessed art thou, Simon Bar-jonah: for flesh and blood hath not revealed it unto thee, but my Father who is in heaven.	Jesus answered him, “Blessed are you, Simon Bar Jonah, for flesh and blood has not revealed this to you, but my Father who is in heaven.	Jesus replied, “Blessed are you, Simon son of Jonah! For this was not revealed to you by flesh and blood, but by My Father in heaven.
16:18	And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it.	And I also say unto thee, that thou art Peter, and upon this rock I will build my church; and the gates of Hades shall not prevail against it.	I also tell you that you are Peter, and on this rock I will build my assembly, and the gates of Hades will not prevail against it.	And I tell you that you are Peter, and on this rock I will build My church, and the gates of Hades will not prevail against it.
16:19	And I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven: and whatsoever thou shalt loose on earth shall be loosed in heaven.	I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven; and whatsoever thou shalt loose on earth shall be loosed in heaven.	I will give to you the keys of the Kingdom of Heaven, and whatever you bind on earth will have been bound in heaven; and whatever you release on earth will have been released in heaven.”	I will give you the keys of the kingdom of heaven. Whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven.”

The Greek

12 words

Greek text: SBLGNT, with morphological parsing from MorphGNT. Each card gives the form as it stands in the text, its dictionary form, and its parsing.

ΠέτροςPetros

noun · nominative singular masculine

Peter; “rock, stone”

Not a name anyone bore before this. Simon is given it as a title, and the Gospels are conscious of the fact: John 1:42 has Jesus assign it at their first meeting, and glosses it — Κηφᾶς, Cephas, “which is by interpretation, Peter.” Paul, writing earlier than any Gospel, usually just calls him Κηφᾶς (Galatians 1:18; 1 Corinthians 1:12). The underlying name is Aramaic kepha, rock.

πέτραpetra

noun · dative singular feminine

rock; bedrock, a rock mass

The word Jesus builds on. It is often claimed that πέτρος means a small detached stone and πέτρα a great living rock, so that Jesus deliberately contrasts the pebble with the bedrock. That distinction is real in Attic poetry, centuries earlier. It had faded by the first century, and Koine prose treats the two as effectively interchangeable. The point is conceded by Protestant commentators as readily as Catholic ones: had Matthew wanted an unmistakable contrast, λίθος — “stone” of any size — was sitting there unused, and using it would have destroyed the wordplay. The wordplay is the point.

ταύτῃtautē

demonstrative pronoun · dative singular feminine

this

The hinge of the whole dispute, and the place where a popular argument collapses. It is sometimes urged that ταύτῃ is feminine while Πέτρος is masculine, so the demonstrative cannot be pointing at Peter. This proves nothing. A Greek demonstrative agrees with the noun it modifies — here πέτρᾳ, which is feminine — and it would be feminine whoever or whatever the phrase referred to. The gender is grammatically compulsory, not significant. What is significant is the shift in person: Jesus has been addressing Peter directly (σὺ εἶ, “you are”), and then moves to a demonstrative phrase rather than saying ἐπὶ σοί, “on you.” That shift is the strongest textual argument the confession reading has.

ἐπὶepi

preposition · with dative

on, upon

With the dative, of the base or ground a thing rests on — the same construction as the house built ἐπὶ τὴν πέτραν at the end of the Sermon on the Mount (Matthew 7:24–25), which is the only other place in Matthew where anything is built on a πέτρα. There the rock is Jesus' own words, and the builder is whoever hears and does them.

οἰκοδομήσωoikodomēsō

verb · 1st person future active indicative singular

I will build

Future, and first person. Whatever the rock is, the builder is Christ and the building is not yet done. The verb governs the whole promise: this is something Jesus undertakes, not something Peter is told to do.

ἐκκλησίανekklēsian

noun · accusative singular feminine

assembly, congregation; church

One of only two places in the Gospels where Jesus uses the word (the other is Matthew 18:17), which has made some scholars suspect a later hand. In ordinary Greek it is simply the citizens called out to assemble; in the Septuagint it renders qahal, the congregation of Israel. The World English Bible translates it “assembly” here rather than “church,” which is a useful jolt: whatever is being promised, it is not in the first instance an institution with an address.

πύλαι ᾅδουpylai hadou

noun nominative plural feminine + noun genitive singular masculine

the gates of Hades

A Hebrew idiom for the realm of the dead — Isaiah 38:10, Job 38:17. Gates are defensive, not offensive; a gate prevails against nobody. So the image is probably not of hell attacking the church but of death being unable to hold what Christ builds. Note also what is promised and what is not: the gates will not prevail against it — αὐτῆς, feminine, agreeing with ἐκκλησίαν, the assembly. The promise is made to the church, not to the rock.

κλεῖδαςkleidas

noun · accusative plural feminine

keys

Behind it stands Isaiah 22:22, where the key of the house of David is laid on the shoulder of Eliakim the steward — a royal major-domo, who opens and shuts. That background matters to the Roman reading, since a steward's office in a royal house is a standing one that outlives the man holding it. It is also the strongest argument for a Petrine reading that does not depend on the word πέτρα at all.

δήσῃς / λύσῃςdēsēs / lysēs

verb · 2nd person aorist active subjunctive singular

you may bind / you may loose

Rabbinic technical terms for declaring forbidden or permitted, and for excluding from or restoring to the community. Singular here, to Peter. But Matthew 18:18 repeats the identical promise in the plural, to the disciples as a body, with no mention of Peter — which is the single most awkward fact for any exclusively Petrine construction of verse 19, and Origen presses exactly this point below.

ΒαριωνᾶBariōna

noun · vocative

son of Jonah

Jesus names Peter's father at the moment Peter names Jesus' Father — a symmetry Chrysostom notices and makes a great deal of: “as thou art son of Jonas, even so am I of my Father.”

ἀπεκάλυψένapekalypsen

verb · 3rd person aorist active indicative singular

revealed, unveiled

Flesh and blood did not do this; the Father did. Whatever is being called blessed, it was received rather than achieved — which is why so many of the Fathers who read the rock as the confession insist that the confession is not Peter's accomplishment but God's gift, and therefore not his private property.

σκάνδαλονskandalon

noun · nominative singular neuter

a stumbling-block, a snare

From five verses later (16:23). Peter objects to the passion prediction and Jesus answers: “Get behind me, Satan! You are a σκάνδαλον to me.” Matthew has put the two scenes side by side deliberately. In the space of a page the same man is the rock and the stone you trip over — a juxtaposition every reading of verse 18 has to absorb somehow, and which none of them absorbs comfortably.

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Three Readings

IThe rock is Peterthe man himself

The plainest reading of the sentence as it stands. Jesus renames Simon “Rock” and in the very next breath says he will build on “this rock.” To make the demonstrative jump over the noun it was just coined from, to a confession mentioned two verses earlier, is to make Matthew write badly on purpose.

The lexical objection fails: πέτρος and πέτρα are not meaningfully distinguished in Koine, and if a contrast had been wanted, λίθος was available. The gender objection fails too, for the reason given in the word cards. And the whole verse is addressed to Peter in the second person singular throughout — blessed are you, to you I say, you are Peter, I will give you the keys, whatever you bind. To make the one clause in the middle refer to something other than the man being addressed is special pleading.

In Aramaic, which is what Jesus most likely spoke, the wordplay is exact and the whole difficulty vanishes: You are Kepha, and on this kepha I will build. That the underlying name was Kepha is not a conjecture — John 1:42 glosses it and Paul uses it as a matter of course.

This is now the ordinary view of critical commentators, and notably not a confessional one: Protestant scholars have been conceding it for a century, on the grammar, while continuing to deny everything Rome infers from it.

IIThe rock is the confessionwhat Peter said

The reading with the deepest patristic roots, and it is not a Reformation invention: Chrysostom, Hilary, Theodoret and Cyril all state it plainly, centuries before there was a Protestant to want it.

Its textual purchase is the change of construction. Jesus says σὺ εἶ Πέτρος — direct address, second person — and then does not say ἐπὶ σοί, “on you,” which was the obvious phrase and two syllables shorter. He shifts to a demonstrative. Something has changed referent, and the nearest thing in view that is not Peter is the confession the Father had just revealed.

The context is built around that confession. The whole pericope is a question about identity: who do people say, who do you say. Peter's answer is singled out as something flesh and blood could not produce. The blessing is pronounced on a man for a thing he has just been given to see. On this reading the rock is that seeing — and its permanence is God's, not Peter's, which is why the gates of death cannot prevail.

It also survives verse 23 without embarrassment. If the rock is the confession, then the man who confesses can become a stumbling-block five verses later without the foundation of the church moving an inch.

IIIThe rock is Christthe one confessed

Augustine's mature preference, and the reading with the most explicit New Testament support elsewhere — which is exactly why he preferred it.

Paul says flatly that no other foundation can be laid than the one that is laid, Jesus Christ (1 Corinthians 3:11); that the rock in the wilderness “was Christ” (1 Corinthians 10:4); and that the household is built on the foundation of the apostles and prophets with Christ himself as the cornerstone (Ephesians 2:20). Peter himself, in his own letter, calls Christ the living stone and the believers living stones built on him (1 Peter 2:4–8) — and never once claims the title for himself.

Augustine's move is to read the naming as figurative and derivative: “Peter is so called from the rock; not the rock from Peter; as Christ is not called Christ from the Christian, but the Christian from Christ.” Peter gets the name because of what he is joined to. He represents the church, which is built on Christ.

Its weakness is that it requires the most work from the sentence itself. Nothing in Matthew 16 says the rock is Christ; the reading is imported, powerfully, from the rest of the canon. Augustine knew this, which is why — uniquely among the Fathers on this page — he ends up refusing to decide.

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The Fathers

10in date order

the rock is Peterthe rock is the confessionthe rock is Christ

Tertullianc. 155 – c. 225Carthagepeter

On Modesty (De Pudicitia) 21 · c. 220

The earliest substantial comment, and it cuts in two directions at once. Tertullian grants that the rock is Peter personally — and then uses that very fact to deny that any later bishop inherits anything. He is arguing against a bishop who had claimed the power to absolve adultery.

If, because the Lord has said to Peter, “Upon this rock will I build My Church,” “to thee have I given the keys of the heavenly kingdom;” or, “Whatsoever thou shalt have bound or loosed in earth, shall be bound or loosed in the heavens,” you therefore presume that the power of binding and loosing has derived to you, that is, to every Church akin to Peter, what sort of man are you, subverting and wholly changing the manifest intention of the Lord, conferring (as that intention did) this (gift) personally upon Peter? “On thee,” He says, “will I build My Church;” and, “I will give to thee the keys,” not to the Church.

ANF vol. 4

Origenc. 185 – c. 253Alexandria / Caesareathe confession

Commentary on Matthew XII.10–11 · c. 246

Origen democratises the promise. Anyone who makes Peter's confession by the Father's revelation becomes what Peter was — and he presses the objection that has never gone away: if the promise is Peter's alone, what happens to the rest of the Twelve? The NPNF editors gave his section 11 a heading that says it all: “The Promise Given to Peter Not Restricted to Him, But Applicable to All Disciples Like Him.”

And if we too have said like Peter, “Thou art the Christ, the Son of the living God,” not as if flesh and blood had revealed it unto us, but by light from the Father in heaven having shone in our heart, we become a Peter … For a rock is every disciple of Christ of whom those drank who drank of the spiritual rock which followed them, and upon every such rock is built every word of the church, and the polity in accordance with it. … But if you suppose that upon that one Peter only the whole church is built by God, what would you say about John the son of thunder or each one of the Apostles? Shall we otherwise dare to say, that against Peter in particular the gates of Hades shall not prevail, but that they shall prevail against the other Apostles and the perfect?

ANF vol. 9

Cyprianc. 200 – 258Carthagepeter

On the Unity of the Church 4 · 251

Cyprian makes Peter the origin of the church's unity — and then, in the same paragraph, insists the other apostles were exactly what Peter was, with equal honour and equal power. He wants a visible principle of unity, not a superior officer. What he does not say here has been the subject of a long textual quarrel; see the note below.

The Lord speaks to Peter, saying, “I say unto thee, that thou art Peter; and upon this rock I will build my Church…” And although to all the apostles, after His resurrection, He gives an equal power, and says, “As the Father hath sent me, even so send I you…” yet, that He might set forth unity, He arranged by His authority the origin of that unity, as beginning from one. Assuredly the rest of the apostles were also the same as was Peter, endowed with a like partnership both of honour and power; but the beginning proceeds from unity.

A textual warning. Chapter 4 circulates in two forms. The longer adds clauses that read much more strongly for Roman primacy — “the primacy is given to Peter … one Church of Christ and one See,” and “who deserts the chair of Peter, upon whom the Church is founded.” The nineteenth-century ANF editors printed those as interpolations and called them “beyond all question spurious.” Twentieth-century critical work, above all Maurice Bévenot's, argued instead that Cyprian wrote both recensions and revised his own text. The question is genuinely open, so the plain form is quoted here and the disputed clauses are named rather than used.

ANF vol. 5

Hilary of Poitiersc. 310 – c. 367Gaulthe confession

On the Trinity VI.36–37 · c. 356–360

Hilary is arguing about the deity of Christ, not about church order, which makes his testimony unusually clean — he has no stake in the question we are asking.

And this is the rock of confession whereon the Church is built. … This faith it is which is the foundation of the Church; through this faith the gates of hell cannot prevail against her. This is the faith which has the keys of the kingdom of heaven. Whatsoever this faith shall have loosed or bound on earth shall be loosed or bound in heaven. This faith is the Father's gift by revelation.

NPNF ser. 2 vol. 9

Ambrosec. 339 – 397Milanpeter

Exposition of the Christian Faith IV.5.57 · c. 380

Ambrose, in passing and while arguing about something else entirely, treats it as obvious that Peter is the rock and the foundation.

Could He not, then, strengthen the faith of the man to whom, acting on His own authority, He gave the kingdom, whom He called the Rock, thereby declaring him to be the foundation of the Church?

NPNF ser. 2 vol. 10

Jeromec. 347 – 420Syrian desert, writing to Romepeter

Letter 15, to Pope Damasus · 376/377

Jerome, isolated in the desert amid the Antiochene schism and wanting a court of appeal, writes to Damasus and identifies the rock with the Roman see about as directly as anyone in the fourth century does. It is worth reading as what it is — a letter seeking adjudication, at its rhetorical fullest.

As I follow no leader save Christ, so I communicate with none but your blessedness, that is with the chair of Peter. For this, I know, is the rock on which the church is built! This is the house where alone the paschal lamb can be rightly eaten. This is the ark of Noah, and he who is not found in it shall perish when the flood prevails.

NPNF ser. 2 vol. 6

John Chrysostomc. 347 – 407Antioch / Constantinoplethe confession

Homilies on Matthew LIV.3 · c. 390

The great Antiochene preacher, expounding the verse directly rather than in passing, glosses “this rock” in four words.

Therefore He added this, “And I say unto thee, Thou art Peter, and upon this rock will I build my Church;” that is, on the faith of his confession.

NPNF ser. 1 vol. 10

Augustine354 – 430Hippochrist

Sermon 76.1; Tractates on John 124.5; Retractations I.21.1 · c. 400–427

Augustine preached the Christ reading with great force for decades — and then, at the very end of his life, reviewing everything he had ever written, he set the two readings side by side and declined to choose between them. It is the most honest paragraph any Father wrote on the subject, and this page is in some sense a footnote to it.

“Therefore,” he saith, “Thou art Peter; and upon this Rock” which thou hast confessed, upon this Rock which thou hast acknowledged, saying, “Thou art the Christ, the Son of the living God, will I build My Church;” that is upon Myself, the Son of the living God, “will I build My Church.” I will build thee upon Myself, not Myself upon thee.

For petra (rock) is not derived from Peter, but Peter from petra; just as Christ is not called so from the Christian, but the Christian from Christ. … For the Rock (Petra) was Christ; and on this foundation was Peter himself also built.

Tractates on John 124.5 — NPNF ser. 1 vol. 7

And then, in the Retractations of 426/427, correcting his own earlier work:

In quo dixi quodam loco de apostolo Petro, quod in illo tamquam in petra fundata sit Ecclesia … Sed scio me postea saepissime sic exposuisse quod a Domino dictum est: Tu es Petrus, et super hanc petram aedificabo Ecclesiam meam, ut super hunc intellegeretur quem confessus est Petrus dicens: Tu es Christus filius Dei vivi, ac sic Petrus ab hac petra appellatus personam Ecclesiae figuraret, quae super hanc petram aedificatur et accepit claves regni caelorum. Non enim dictum illi est: “Tu es petra”, sed: Tu es Petrus. Petra autem erat Christus; quem confessus Simon, sicut eum tota Ecclesia confitetur, dictus est Petrus. Harum autem duarum sententiarum quae sit probabilior, eligat lector.

In this book I said in one place about the apostle Peter that the Church was founded upon him as upon a rock … But I know that afterwards I very often explained what the Lord said — You are Peter, and upon this rock I will build my Church — to mean that it should be understood of him whom Peter confessed when he said, You are the Christ, the Son of the living God; and that Peter, named from this rock, represented the person of the Church, which is built upon this rock and has received the keys of the kingdom of heaven. For it was not said to him “You are the rock,” but “You are Peter.” And the rock was Christ — whom Simon confessed, as the whole Church confesses him, and was therefore called Peter. But which of these two opinions is the more probable, let the reader choose.

Sermon 76.1 (NPNF ser. 1 vol. 6, Sermon XXVI)

Theodoret of Cyrusc. 393 – c. 458Syriathe confession

Letter 146 · c. 450

Theodoret reads the rock as the confession and immediately ties it to Paul's foundation — the two readings that are usually opposed, held together in one breath.

Let us hear the words of the great Peter, “Thou art the Christ, the Son of the living God.” Let us hear the Lord Christ confirming this confession, for “On this rock,” He says, “I will build my church and the gates of Hell shall not prevail against it.” Wherefore too the wise Paul, most excellent master builder of the churches, fixed no other foundation than this. “I,” he says, “as a wise master builder have laid the foundation … For other foundation can no man lay than that is laid, which is Jesus Christ.”

NPNF ser. 2 vol. 3

Leo the Greatc. 400 – 461Romepeter

Sermon 3 · c. 445

With Leo the reading becomes an office. He is the first to argue at length that what was given to Peter continues in Peter's successors — not as a new claim about the verse, but as a claim about what the verse instituted. This is the doctrine that Vatican I would define fourteen centuries later.

For the solidity of that faith which was praised in the chief of the Apostles is perpetual: and as that remains which Peter believed in Christ, so that remains which Christ instituted in Peter. … The dispensation of Truth therefore abides, and the blessed Peter persevering in the strength of the Rock, which he has received, has not abandoned the helm of the Church, which he undertook.

NPNF ser. 2 vol. 12

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What the Greek Settles

The honest answer to “does the Greek tell us?” is: it settles less than either side wants, and it settles it in an inconvenient pattern — knocking out the popular arguments of both parties while leaving the real question open.

What the Greek settles

The pebble-and-boulder argument is dead.

πέτρος and πέτρα are not distinguished as “small stone” and “massive rock” in first-century Greek. That distinction belongs to much earlier Attic verse. Anyone still resting the confession reading on it is resting it on a lexical claim that Koine does not support — and Protestant commentators have said so as plainly as Catholic ones.

The gender argument is dead.

ταύτῃ is feminine because πέτρα is feminine. It could not have been anything else, whatever it points to. It carries no information about the referent at all.

The change of form is explicable without a change of referent.

πέτρα is a feminine noun; a man is not called by it. Πέτρος is the masculine form the name requires. So the shift from Πέτρος to πέτρα is exactly what you would expect even if both refer to Peter.

Underneath, there was probably one word.

If the exchange happened in Aramaic, it ran Kepha … kepha, with no distinction available to exploit. John 1:42 and Paul's habitual Κηφᾶς put that name beyond reasonable doubt. This weighs for the Peter reading — with the caveat that Matthew wrote in Greek, and the Greek is what the church actually received.

Verse 19 is not exclusive.

Whatever binding and loosing is, Matthew 18:18 gives it in the plural to the disciples as a body. This is a fact about the text, not an interpretation of it.

What it does not

What the demonstrative points at.

This is the whole question, and Greek syntax does not answer it. A demonstrative can point to the nearest noun — which is Πέτρος — or to the substance of what has just been said. Both are ordinary Greek. The choice between them is made on context, theology and temperament, not on grammar.

Why Jesus did not say “on you.”

ἐπὶ σοί was available, shorter, and unambiguous. That he did not use it is the confession reading's best card. But it is an argument from what an author declined to write, and the wordplay supplies an obvious motive for declining — you cannot pun on a name you do not repeat.

Anything at all about succession.

This is the largest gap, and the one most often stepped over. Even granting every point to the Peter reading, the sentence says nothing whatever about who comes after Peter, or where they sit. Tertullian read the rock as Peter and drew the opposite conclusion about later bishops in the same paragraph. The step from the man to the office is made elsewhere, on other grounds.

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The Further Step

Suppose the rock is Peter. What follows?

Nothing yet, is the short answer — and the distinction between the two questions is not a Protestant debating tactic. It is visible in the Fathers themselves. Tertullian, who reads the rock as Peter personally, uses that reading to deny that the power passed to anyone else. Cyprian, who makes Peter the origin of unity, says in the same paragraph that the other apostles held equal honour and equal power. The inference from “Peter is the rock” to “the bishop of Rome holds Peter's office” is a further step, taken over centuries, on grounds that include the keys of Isaiah 22, the practice of appeal to Rome, the Roman martyrdoms of Peter and Paul, and a good deal of history that has nothing to do with Matthew 16.

Leo the Great is where that step becomes explicit and load-bearing. At Chalcedon in 451 the assembled bishops acclaimed his doctrinal letter with the cry that Peter has spoken through Leo — a sentence usually quoted as though it settled the matter, though what the council was acclaiming was the orthodoxy of a Christological statement, not a theory of jurisdiction.

The claim reached its definitive form only in 1870, when the First Vatican Council defined it and attached an anathema:

“If anyone says that blessed Peter the apostle was not appointed by Christ the lord as prince of all the apostles and visible head of the whole church militant; or that it was a primacy of honour only and not one of true and proper jurisdiction that he directly and immediately received from our lord Jesus Christ himself: let him be anathema.”

First Vatican Council, Pastor Aeternus (1870), chapter 1

Two things are worth noticing about that definition. It defines a primacy of jurisdiction rather than of honour — that is the precise point at issue, and the Eastern churches, which have always granted Rome a primacy of honour, part company exactly there. And it was promulgated in 1870, which is to say that the doctrine in its defined form is younger than the telegraph. Neither observation refutes it; development is not by itself corruption, and every tradition on this page holds doctrines that took centuries to state. But it does locate the claim historically, which the argument from Matthew 16 alone tends to obscure.

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The Other Stones

Matthew 16:18 is not the only place the New Testament calls something a foundation, and the others pull in a direction of their own. Set them together and the picture is stranger than any single reading.

1 Corinthians 3:11

“For other foundation can no man lay than that is laid, which is Jesus Christ.”

Paul, flatly, and with no apparent awareness that the question could be raised.

Ephesians 2:20

“And are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone.”

The apostles — plural — are the foundation, with Christ as the cornerstone. Neither the Peter reading nor the Christ reading gets this verse entirely to itself.

1 Peter 2:4–5

“To whom coming, as unto a living stone, disallowed indeed of men, but chosen of God, and precious, ye also, as lively stones, are built up a spiritual house.”

Peter's own letter. He calls Christ the living stone and the whole church living stones — and never claims the title for himself. Whatever he understood Jesus to have said to him, this is how he wrote about rocks.

Matthew 16:23

“But he turned, and said unto Peter, Get thee behind me, Satan: thou art an offence unto me.”

Five verses later. The rock is a stumbling-block.

Matthew 18:18

“Whatsoever ye shall bind on earth shall be bound in heaven: and whatsoever ye shall loose on earth shall be loosed in heaven.”

The same promise as verse 19, in the plural, to all of them.

Matthew 7:24–25

“I will liken him unto a wise man, which built his house upon a rock … for it was founded upon a rock.”

The only other πέτρα built on in this Gospel. There the rock is hearing Jesus' words and doing them.

Questions This Passage Raises

If Matthew had meant the confession, why did he keep the pun?

The wordplay is the most conspicuous feature of the sentence, and a writer who wanted to point away from Peter had every means of doing so. This is the question the confession reading has to keep answering.

If Matthew meant Peter, why not ἐπὶ σοί?

“On you” was shorter, plainer, and unambiguous. The pun explains the choice, but does not quite dissolve the oddity. This is the question the Peter reading has to keep answering.

Why does the promise of verse 19 reappear in chapter 18, in the plural?

Origen asked it in the third century and no one has produced an answer that makes the Petrine construction of verse 19 exclusive without straining chapter 18.

What is Matthew doing by putting verse 23 five verses after verse 18?

Rock, then stumbling-block, with no attempt to soften the juxtaposition. Every reading must say something about this, and most say very little.

Can a primacy be real and yet not be an office?

Almost everyone concedes Peter some kind of pre-eminence among the Twelve — Calvin does, explicitly. The dispute is whether pre-eminence in a person becomes jurisdiction in a chair. That is where the East and Rome actually divide, and it is not a question about Greek.

What would change if the answer were settled?

Worth asking honestly. If the rock is Peter, the papacy is not thereby established; if the rock is the confession, the papacy is not thereby refuted. The verse carries far less of the weight of the argument than the volume of the argument suggests.

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Every quotation on this page was taken verbatim from a downloaded text of the Ante-Nicene and Nicene & Post-Nicene Fathers, not from a quotation collection — the volume is named under each. Patristic florilegia on this subject are notoriously partisan in both directions, and quotations circulate that cannot be found in the works they are attributed to.

Augustine's Retractations

Not included in the NPNF series. The Latin was taken from the text of Retractationum libri duo I.21.1 published at augustinus.it and checked against a second witness; the two differ only in the word order of one clause (dictum illi est / dictum est illi). The English translation is my own, made for this page from that Latin, and is dedicated to the public domain under CC0.

Quotation versus summary

Ancient and Reformation authors are quoted verbatim. Modern critical commentators — France, Carson, Davies & Allison, Luz, Cullmann, Keener — are summarised and not quoted, both because their work is in copyright and because what matters here is the state of the discussion rather than any one scholar's phrasing.

No verdict

This page does not decide what “this rock” refers to. It reports what the Greek can establish, what it cannot, and how ten Fathers read it — including Augustine, who considered both readings, preferred one, and told the reader to choose. That is the position this desk is in as well.