Four Words, One Claim
Every Sunday, Catholics stand and profess in the Creed: “I believe in one, holy, catholic, and apostolic Church.” These four words — one, holy, catholic, apostolic — are called the “four marks” of the Church. They are not descriptions of what the Church hopes to become. They are descriptions of what she is — identifying characteristics given to her by Christ, present from the beginning, and verifiable today.
The four marks serve a practical purpose. If Christ founded one Church — and He said He would (Matthew 16:18) — then it should be possible to identify that Church. The marks are the identifying features. They are like a description on a passport: if the Church you are looking at is one, holy, catholic, and apostolic, you have found the Church Christ built. If it is missing any of the four, you have not.
One
The Church is one. Not in the sense that all her members agree on everything — they obviously do not — but in a deeper sense. She has one faith, one baptism, one system of sacraments, one visible head (the Pope), and one invisible head (Christ). She is a single body, not a federation of independent communities.
This oneness is both visible and invisible. Visibly, every Catholic parish in the world is in communion with the Bishop of Rome. The Mass celebrated in Melbourne is the same Mass celebrated in Manila, in Manchester, and in Montevideo. The Creed is the same. The sacraments are the same. The moral teaching is the same. This is not uniformity — there is enormous diversity in language, culture, and spiritual tradition within the Church — but it is unity. One Church, visibly connected, recognisably the same.
Invisibly, the Church is one because she is animated by one Spirit. The Holy Spirit unites the members of the Church the way a soul unites the parts of a body. This is not a metaphor. St Paul calls the Church the Body of Christ (1 Corinthians 12:27), and he means it. The unity of the Church is supernatural — it comes from God, not from human organisation.
The existence of over thirty thousand Protestant denominations — each with its own interpretation of Scripture, its own governance, its own theology — is, from the Catholic perspective, evidence that something has gone wrong. Christ prayed “that they may all be one” (John 17:21). The fragmentation of Christianity is a wound, not a feature. The Catholic Church does not claim to have caused the wound, but she does claim to have preserved the unity Christ intended.
Holy
The Church is holy. This is perhaps the most contested of the four marks, because the Church’s members — including her leaders — are so obviously not always holy. Scandals, corruption, cruelty, hypocrisy — the Church’s history is stained with all of these. How can an institution with such a record be called holy?
The answer is that holiness belongs to the Church not because of her members but because of her founder and her mission. Christ is holy. The sacraments He instituted are holy. The doctrine He entrusted to the Church is holy. The grace that flows through the Church is holy. The Church is holy because she is Christ’s — not because the people in her are perfect.
But the Church also produces holiness. In every century, in every culture, she has produced saints — men and women of extraordinary virtue, generosity, and love. Not despite the Church but through her. The sacraments work. The teaching sanctifies. The grace transforms. The Church is a hospital for sinners, not a museum of saints — but the hospital works. People come in sick and leave healed.
The scandals are real and must be acknowledged honestly. But they are betrayals of the Church’s holiness, not evidence that holiness was never there. A doctor who commits malpractice does not prove that medicine is false. A priest who sins grievously does not prove that the Church he represents is unholy. It proves that he failed to live up to what the Church gave him.
Catholic
The Church is catholic — a word that comes from the Greek katholikos, meaning “universal” or “according to the whole.” It means that the Church is for everyone, everywhere, in every age. She is not a local religion, not a national church, not a club for a particular class or culture. She is for all peoples, all nations, all times.
This universality is visible. The Catholic Church is present in every country on earth. She worships in thousands of languages. She embraces every culture without being captured by any of them. A Catholic can walk into a church anywhere in the world — Tokyo, Lagos, Buenos Aires, Kraków — and find the same Mass, the same sacraments, the same faith. The faces change. The language changes. The faith does not.
Catholic also means “according to the whole” — the Church possesses the fullness of the faith. She has all seven sacraments, the complete canon of Scripture, the unbroken teaching of the Apostles, and the visible successor of St Peter. Other Christian communities may have some of these things. The Catholic Church claims to have all of them.
St Ignatius of Antioch, writing around 107 AD — within living memory of the Apostles — was the first to use the word “catholic” to describe the Church: “Where the bishop is, there is the catholic Church.” The word has been in continuous use ever since. It is not a label chosen for marketing purposes. It is a description — and it has been accurate for two thousand years.
Apostolic
The Church is apostolic — she traces her origins directly to the Apostles chosen by Christ, and her bishops are the successors of those Apostles in an unbroken line of ordination stretching back to the first century.
This is not a vague spiritual connection. It is a historical, verifiable chain. Every Catholic bishop can, in principle, trace his ordination back through a line of bishops to one of the twelve Apostles. The Bishop of Rome — the Pope — is the successor of St Peter, whom Christ appointed as the head of the Apostles. This unbroken succession is called apostolic succession, and the Catholic Church claims it as one of her defining characteristics.
Apostolic succession matters because it is the mechanism by which the faith is transmitted. The Apostles received the faith from Christ. They ordained bishops to succeed them. Those bishops ordained more bishops. And so on, century after century, to the present day. The faith you profess at Mass on Sunday is not a modern interpretation of ancient texts. It is the same faith the Apostles professed, handed down through an unbroken chain of ordained teachers.
This is also why the Church claims authority to interpret Scripture. She does not stand under Scripture as though it fell from the sky. She stands with Scripture, because her bishops are the successors of the men who wrote it, received it, preserved it, and defined its canon. The Bible is the Church’s book — written by her members, for her members, under the guidance of the Holy Spirit who animates her.
Why the Marks Matter
The four marks are not a checklist for winning arguments. They are an invitation to look at the Catholic Church with fresh eyes — to ask whether this institution, for all her human failings, might actually be what she claims to be: the Church founded by Jesus Christ, preserved by the Holy Spirit, and entrusted with the fullness of the faith.
She is one — visibly united when Christianity as a whole is fragmented. She is holy — producing saints in every age despite the sins of her members. She is catholic — universal in a way no other institution on earth can match. She is apostolic — tracing her lineage in an unbroken line to the men who walked with Christ.
No other Christian community claims all four marks. Many claim one or two. But the Catholic Church has claimed all four since the beginning — and the Creed you recite every Sunday is your profession that this claim is true.