The Church

The Church is not a human institution built on an idea, nor the sum of the denominations, but the Body of Christ — the one people of God, founded by Christ, filled with the Holy Spirit at Pentecost, and confessed in the Creed as one, holy, catholic, and apostolic.

For Inquirers

When people hear "the Church," they usually picture a building with a steeple, or one brand of Christianity among many — "the Catholic church down the street," "the Baptist church my aunt goes to." What the word means here is stranger, and more alive, than either of those.

The word the Bible uses (ekklesia) simply means an assembly — a people gathered together. But Christians came to see that this particular gathering is something no ordinary group could ever be, and they gave it an astonishing name: the Body of Christ. Picture Jesus as the head of a living body, and everyone joined to him — all over the world, and even those who have died and are now with God — as its hands and feet and members, all sharing one life the way the parts of your own body share yours. The Church, in other words, isn't a club that some people started in order to talk about Jesus. It's more like a living thing that he himself is alive in.

That's why Orthodox Christians say something that can catch a newcomer off guard: they don't think of "the Church" as the grand total of all the different denominations added up together, but as one single Body — which Christ founded, filled with his own Spirit at a moment called Pentecost, and promised would never be destroyed, however many empires rose and fell around it. Not a movement that people keep going, but a living thing that God keeps alive.

Overview

• The Church is the Body of Christ — the assembly (Greek ekklesia) of God's people gathered in Him, with Christ as the head and the faithful as His members. It is a living organism, not a human organization built around an idea.
• It is not an invention of the New Testament but the covenant people of God — the "assembly" of Israel — carried forward and filled full in Christ, and thrown open to all the nations.
• The Creed confesses it in four words: one, holy, catholic, and apostolic. Christ founded it, the Holy Spirit fills it, and the "gates of Hades" will never prevail against it.

Summary

The word ekklesia, "church," is the same word the Greek Old Testament uses for the "assembly" of Israel gathered at Sinai (Acts 7.38), so the Church is not a fresh invention of the New Testament but the covenant people of God carried forward and brought to fullness in Christ — now opened to all the nations who stream to the mountain of the Lord — "all nations shall come to it" (Isaiah 2.2-3). Its deepest reality is that it is the Body of Christ: Christ is "the head of the body, the assembly" (Colossians 1.18), and the faithful are His members, so that the Church is a living organism sharing one life, not a club sharing an opinion. Christ founds it on the confession of Peter — "on this rock I will build my assembly, and the gates of Hades will not prevail against it" (Matthew 16.18) — and it is born in power when the Holy Spirit descends at Pentecost. The Nicene Creed confesses this one Church by four marks: it is one (a single Body, not a federation of divided groups), holy (sanctified by Christ, though it gathers sinners), catholic (possessing the whole faith and fullness of God, in every place), and apostolic (built on the apostles' foundation and handing their faith down unbroken). St. Paul calls it "the assembly of the living God, the pillar and ground of the truth" (1 Timothy 3.15). Cross-link Schism, Invisible vs Visible Church, Apostolic Succession, Ecumenical Councils.

Not a building, and not a club — the Body of Christ

Everything in the Orthodox understanding of the Church follows from one image that St. Paul uses again and again, and never as a mere figure of speech. The Church, he says, is the body of Christ. "He is the head of the body, the assembly" (Colossians 1.18); God "gave him to be head over all things for the assembly, which is his body, the fullness of him who fills all in all" (Ephesians 1.22-23); "now you are the body of Christ, and members individually" (1 Corinthians 12.27). This is worth slowing down on, because it changes the whole category. A club is a collection of individuals who share a purpose and could, in principle, be swapped out or disband tomorrow. A body is not like that. Its members do not merely cooperate; they share a single life, and that life comes from the head. To belong to the Church, on this account, is not to have signed up for an organization that promotes Christianity, but to have been joined — really, organically — to Christ Himself, as a hand is joined to a body. "For in one Spirit we were all baptized into one body" (1 Corinthians 12.13).

This is why the Church cannot finally be defined by its buildings, its administration, or even its members' efforts, true and necessary as all of those are. The Church is where Christ is, living by His Spirit in a people He has made His own. That single conviction is the root from which the four marks of the Creed all grow.

From the assembly of Israel to all the nations

The Church did not begin in the first century. When the New Testament reaches for a word to name the new people of God, it chooses ekklesia — the very word the Greek Old Testament had long used for the "assembly" of Israel gathered before God. St. Stephen speaks of Moses "in the assembly in the wilderness" (Acts 7.38), using the same word the Gospels use for the Church. The point is deliberate: the Church is Israel come to fullness, the ancient covenant people carried forward and completed in Christ, not a rival to them or a fresh start unrelated to them. What is new is the scope. The prophets had foreseen a day when the people of God would burst its old boundaries — "in the last days… the house of God shall be on the top of the mountains… and all nations shall come to it" (Isaiah 2.2-3). In Christ that day arrives, and the assembly of one nation becomes the assembly of all of them.

Its founding is announced by Christ Himself, at Caesarea Philippi, in answer to Peter's confession that He is the Son of the living God: "on this rock I will build my assembly, and the gates of Hades will not prevail against it" (Matthew 16.18). And it is brought to birth in power at Pentecost, fifty days after the Resurrection, when the Holy Spirit descends on the gathered disciples and the Church steps out into history — a community "steadfastly" devoted to "the apostles' teaching and fellowship, in the breaking of bread, and prayer" (Acts 2.42). Founded by the Son, filled by the Spirit, rooted in the covenant of the Father: the Church is, from its first day, the work of the whole Trinity.

Born from within Christ's glory, not after it

It is easy to hear that the Church was "born at Pentecost" and picture the Church as a later thing — a society the apostles founded once Jesus had risen, ascended, and departed. The Church therefor was left behind to carry on his mission in his earthly absence. On that picture the Church is Christ's successor: an institution running on a charter deposited by a founder who has since gone home. It is a natural way to read the story, and something close to it has been the instinctive assumption of much of Western Christianity. The New Testament however, once read closely, will not quite agree with this...

Lets begin with how the New Testament narrates the events that follow the Cross. St. Luke, writing as a careful historian, lays them out as a sequence spread across time: the Resurrection on the third day, then forty days in which the risen Christ appears to his disciples, then the Ascension, and then — ten days further on, at the fiftieth day — the descent of the Spirit at Pentecost (Acts 1.1-11; Acts 2.1-4). Read this way, each event is a distinct station along a timeline, and Pentecost, the Church's birthday, stands at the far end of it, once the others are already finished.

St. John tells the very same reality in an entirely different way — compressed, astonishingly, into the single day of the Resurrection. On Easter morning the risen Christ tells Mary Magdalene, "I am ascending to my Father and your Father, to my God and your God" (John 20.17) — the Ascension spoken of as already underway on the first day. That same evening he comes and stands among the gathered disciples, shows them his wounds, and commissions them with the words that found the Church's entire mission: "as the Father has sent me, even so I send you." And then "he breathed on them, and said to them, 'Receive the Holy Spirit'" (John 20.21-22) — the gift of the Spirit, John's own Pentecost, bestowed that very night. Resurrection, Ascension, the sending of the Spirit, and the Church's founding commission: in John all of it belongs to one day, because all of it belongs to one event.

John is not contradicting Luke, and neither of them is simply mistaken about the calendar. John is showing the theological unity that Luke's timeline, precisely by laying the events out in order, cannot help but obscure. The Orthodox theologian and historian John McGuckin names what the Fourth Gospel has seen: these are "aspect events of one and the same 'eschatological mystery.'"[^mcguckin] The word eschatological is carrying real weight there, and it repays unpacking. An ordinary event sits inside the stream of time as one moment among others, with a before and an after that hem it in. An event that is eschatological is of another order altogether: it does not merely happen within history but, in McGuckin's phrase, "stands as the cause or explanation of that very sequence"[^mcguckin] — it is what gives the timeline its meaning rather than taking its own place in the line. Christ's return to the Father in glory is exactly such a reality. That is how Luke can spread it across fifty days and John can gather it into one without either of them distorting it: it is a single light, and any timeline is only its spectrum.

Everything turns on this for the doctrine of the Church. If Pentecost is a sequel to Christ's glory — a later chapter that opens only once the glory is complete — then the Church really is a human organization that arrives after him, and its authority can only be the delegated, caretaker kind: instructions left behind and faithfully administered by those who stayed. But if Pentecost is a facet of that one glory, then the Church's birth lies inside Christ's own exaltation rather than downstream of it. McGuckin draws the conclusion without flinching: "the Apostolic preaching that flows from the Pentecostal Spirit… is itself presented by the New Testament as a fundamental part of Jesus's resurrectional glory."[^mcguckin] The mission that brings the Church into being is not the aftermath; it is itself one of the ways the glorification unfolds.

This is what stands behind the claim, startling on first hearing, that the Church is "an extension of the Risen Lord's exalted body"[^mcguckin] — the very arena in which his Lordship, his doxa, is made present and visible in the world. Its authority, on this understanding, is simply the living authority of the glorified Christ himself, present and acting in a Body that is a mode of his own glory. And this is what allows the Creed to call the Church something no merely human society could ever be called: "an eschatological reality, not entirely reducible to a historical or sociological phenomenon"[^mcguckin] — not a thing to be measured by counting everyone who claims the name on any given Sunday. The Body of Christ did not begin after the Resurrection, once the risen Lord had withdrawn. It is one of the ways the Resurrection is still happening.

One

The first thing the Creed confesses about the Church is that it is one. This is not a hope for some future reunion of divided Christians; it is a present fact about the Church's very nature, because the Church's oneness is grounded in the oneness of God. As the Russian theologian Alexei Khomiakov put it, "the Church is one. Her unity follows of necessity from the unity of God; for the Church is not a multitude of persons in their separate individuality, but a unity of the grace of God, living in a multitude of rational creatures" — a unity, he insists, that is "not imaginary or allegorical, but a true and substantial unity, such as is the unity of many members in a living body."[^khomiakov] St. Paul spells out the fact in a drumbeat of "ones": "There is one body and one Spirit… one Lord, one faith, one baptism, one God and Father of all" (Ephesians 4.4-6). And on the night before He died, Christ prayed for His followers "that they may all be one; even as you, Father, are in me, and I in you" (John 17.21) — the unity of the Church is meant to be a living icon of the unity of the Trinity itself.

This is why Orthodoxy does not picture the Church as the sum of the many denominations, a single tree with a hundred branches all equally alive. A body can be wounded; a member can be cut off; but the body itself remains one. When Christians break communion with the Church, the tragedy is real and it is called schism — but it does not divide the one Church into pieces, any more than an amputation turns one body into two. The Church remains one because Christ, its head, is one. (How this one Church relates to the "invisible church" of Protestant thought, and to the many divided Christians of today, is taken up in Invisible vs Visible Church and Schism.)

Holy

The Church is holy — and this is the mark most likely to provoke an honest objection, because the Church is manifestly full of sinners, and always has been. The answer is that the Church is not holy because its members have achieved holiness; it is holy because it belongs to Christ, who has made it His own and is at work making it holy. St. Paul says it exactly: "Christ also loved the assembly and gave himself up for her, that he might sanctify her, having cleansed her by the washing of water with the word, that he might present the assembly to himself gloriously, not having spot or wrinkle or any such thing, but that she should be holy and without defect" (Ephesians 5.25-27). The holiness is Christ's gift and Christ's project, not the congregation's accomplishment. The Church is best understood here not as a museum for the finished but as a hospital for the sick — a place holy precisely because it is where the unholy are being healed. To be scandalized that the Church contains sinners is a little like being scandalized that a hospital contains the ill; that is what it is for. Its holiness is the holiness of its Head and of the grace at work in it, spreading, slowly, into its members (see Theosis).

Catholic

The third mark, catholic, is the one most often misheard. In ordinary English "catholic" has come to mean simply "universal" or "worldwide," and the Church is indeed spread over all the earth. But the Greek behind it, katholikos, means something richer — "according to the whole," the fullness. To call the Church catholic is to say that it possesses the whole faith, the whole of Christ, everywhere and for everyone, so that a small parish in one village has the entire faith, not a fraction of it. St. Cyril of Jerusalem, teaching newcomers in the fourth century, unfolds the word generously: the Church "is called Catholic then because it extends over all the world… and because it teaches universally and completely one and all the doctrines which ought to come to men's knowledge… and because it brings into subjection to godliness the whole race of mankind… and because it universally treats and heals the whole class of sins… and possesses in itself every form of virtue."[^cyril-catholic] The word appears for the first time even earlier, around the year 107, in St. Ignatius of Antioch, and already it is tied to Christ's own presence: "wherever Jesus Christ is, there is the Catholic Church."[^ignatius] The Church is catholic because Christ is wholly present in it — not thinly spread across the globe, but wholly there in every place He is found.

Apostolic

Finally, the Church is apostolic, and this mark answers a practical question: how do we know that the faith of the Church today is the faith Christ actually gave? The answer is that the Church is "built on the foundation of the apostles and prophets, Christ Jesus himself being the chief cornerstone" (Ephesians 2.20) — it rests on the apostles' testimony and has never departed from it. But apostolicity is more than an old foundation; it is a living continuity. The apostles handed their teaching and their ministry to successors, who handed it on again, in an unbroken chain: "the things which you have heard from me among many witnesses, commit the same things to faithful men who will be able to teach others also" (2 Timothy 2.2). This is apostolic succession — not merely a pedigree of ordinations but the guarantee that the faith taught in the Church now is the same faith received from Christ, guarded and passed down rather than reinvented in each generation. St. Ignatius already saw the ordered ministry of bishop, presbyter, and deacon as the visible seam of this continuity, the bishop standing in the place the apostles held.[^ignatius] It is because the Church is apostolic in this way that St. Paul can call it "the assembly of the living God, the pillar and ground of the truth" (1 Timothy 3.15) — the truth does not float free in the world to be assembled by each reader alone, but is held up and kept safe by the living Body that received it (see The Right to Private Judgment, Ecumenical Councils).

The gates of Hades will not prevail

There is one more promise the Church rests on, and it is the boldest of all: that it cannot fail. Christ said the gates of Hades would not prevail against it (Matthew 16.18), and the prophet Daniel, centuries earlier, had foreseen the kingdom God would raise up "in the days of those kings," a kingdom that "shall never be destroyed… shall not be left to another people, but it shall beat to pieces and grind to powder all other kingdoms, and it shall stand for ever" (Daniel 2.44). Empires that looked eternal — Babylon, Persia, Rome — rose, ruled, and fell, and the small assembly of Christ outlasted every one of them. This is what the Church calls its indefectibility: the confidence, resting not on the strength or virtue of its members but on the promise of its Head, that the true faith will never be wholly lost from the earth, and the Body of Christ will never be dissolved. Individual Christians may fall, whole regions may go dark, the Church may be driven into the catacombs — but it will still be there, one and holy and catholic and apostolic, when the last empire has become a line in a history book.

Sources

[^khomiakov]: A. S. Khomiakov, The Church is One (Essay on the Unity of the Church) §1 — "The Church is one. Her unity follows of necessity from the unity of God; for the Church is not a multitude of persons in their separate individuality, but a unity of the grace of God, living in a multitude of rational creatures… the unity of the Church is not imaginary or allegorical, but a true and substantial unity, such as is the unity of many members in a living body." He adds that the division into visible and invisible is "only in relation to man," for "her unity is, in reality, true and absolute." (19th-c. Russian lay theologian). [^cyril-catholic]: St. Cyril of Jerusalem, Catechetical Lectures 18.23 — the Church "is called Catholic then because it extends over all the world, from one end of the earth to the other; and because it teaches universally and completely one and all the doctrines which ought to come to men's knowledge… and because it brings into subjection to godliness the whole race of mankind… and because it universally treats and heals the whole class of sins… and possesses in itself every form of virtue which is named.". [^ignatius]: St. Ignatius of Antioch, Epistle to the Smyrnaeans 8 (c. AD 107) — "Wherever the bishop shall appear, there let the multitude [of the people] also be; even as, wherever Jesus Christ is, there is the Catholic Church"; and "Let no man do anything connected with the Church without the bishop." The earliest surviving use of the phrase "the Catholic Church.". [^mcguckin]: John Anthony McGuckin, The Eastern Orthodox Church: A New History (Yale University Press, 2020), Prelude ("The Naming of Parts") — the glorification events (Resurrection, Ascension, Pentecost) read not as a linear sequence but as "aspect events of one and the same 'eschatological mystery'" that "stands as the cause or explanation of that very sequence" (Luke's historicizing sequence vs. John's compression of it all into Easter day, John 20.1-23); the apostolic preaching from Pentecost as "a fundamental part of Jesus's resurrectional glory"; and the Church as "an extension of the Risen Lord's exalted body," "an eschatological reality, not entirely reducible to a historical or sociological phenomenon." (modern Orthodox theologian and historian).