One, Holy, Catholic, and Apostolic

The phrase belongs to the Nicene-Constantinopolitan Creed, completed at the Second Ecumenical Council in Constantinople in 381. The Creed's ninth article moves, tellingly, without pause from the Holy Spirit to the Church — because the Church is where the Spirit's work is found. The four marks were not invented in 381; the council gathered up what Christians had said about the Church from the beginning and fixed it in the Church's permanent confession. Each mark answers a question an inquirer still asks today.

The Church is one because Christ is not divided and He has one Body, one Bride. "One Lord, one faith, one baptism" (Ephesians 4:5); "one fold, and one shepherd" (John 10:16). This unity is not the unity of a global corporation with a headquarters. It is unity of faith, of sacramental life, and of love among self-governing local churches — the pattern Orthodoxy calls conciliarity. The scandal of Christian division does not disprove the mark: Orthodoxy believes the one Church has never ceased to exist, however grievously Christians have separated from one another, and Christ's prayer "that they all may be one" (John 17:21) remains the standing judgment on every schism.

The Church is holy not because her members are — they manifestly are not — but because her Head is holy and His Spirit sanctifies her. Christ gave Himself for the Church "that he might sanctify and cleanse it" (Ephesians 5:26). Holiness here means what it means throughout Scripture: set apart, belonging to God, filled with His presence. The Church is holy the way a chalice is holy — because of what it carries. And the proof that this holiness is not theoretical is the saints: in every generation the Church actually produces what she promises, human beings transparent to God.

Catholic is the most misunderstood mark, because in modern English the word has become a denominational label. The Greek katholike comes from kath' holou — "according to the whole." It means whole, complete, lacking nothing: the Church that possesses the fullness of the faith, the fullness of the means of grace, the whole Christ. Geographic spread is a consequence of catholicity, not its definition — the Church was already catholic when she fit into one upper room.

The word's earliest surviving Christian use makes the meaning vivid. St. Ignatius of Antioch, writing around the year 107 on his way to martyrdom, told the church at Smyrna: "wherever Jesus Christ is, there is the Catholic Church." Catholicity is not an address; it is the presence of the whole Christ. This is why Orthodoxy can say that every local church gathered with its bishop at the Eucharist is not a fraction or franchise of the Church but the catholic Church, fully present in that place.

The Church is apostolic in two inseparable ways. She is built "upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone" (Ephesians 2:20) — teaching today what the apostles taught, without addition or subtraction. And she is apostolic in her structure: her bishops stand in a traceable line of ordination from the apostles themselves, what the Church calls apostolic succession. Neither works without the other; a pedigree without the apostles' faith is an empty chain, and a claim to the apostles' faith with no living continuity floats free of history.

The word apostolos means "one who is sent," so this mark also faces forward: the apostolic Church is a sent Church, still under the command to "teach all nations" (Matthew 28:19). To confess the four marks is finally to confess where Christ may be reliably found — one Body, made holy by one Spirit, whole in every place, standing where the apostles stood and sent where they were sent.