The Catechism in a Year (with Fr. Mike Schmitz)

Day 24: Unity of Faith (2026)

16 min
Jan 24, 20263 months ago
Listen to Episode
Summary

Fr. Mike Schmitz explores paragraphs 170-175 of the Catechism, focusing on the language of faith and the unity of the Church across cultures and centuries. The episode emphasizes that Christians believe in the realities that faith formulas express, not the formulas themselves, while the Church serves as the guardian and teacher of this unified faith passed down from the apostles.

Insights
  • Faith formulas are essential tools for understanding truth, but they point to deeper realities beyond the words themselves—distinguishing between believing 'in' formulas versus believing 'the' formulas
  • The Church's role as 'pillar and bulwark of truth' demonstrates that Scripture itself affirms the Church's authority in guarding and transmitting revelation, not Scripture alone
  • Apostolic succession provides historical continuity from Jesus through the apostles to modern Church leadership, establishing credibility through direct lineage rather than abstract doctrine
  • Unity of faith across diverse languages, cultures, and geographies is a defining mark of the true Church, achieved through the Holy Spirit's action rather than human uniformity
  • Constant renewal and conversion are essential Christian practices, requiring ongoing submission to Church teaching and openness to the Holy Spirit's guidance
Trends
Growing emphasis on distinguishing between doctrinal formulation and theological reality in religious educationRenewed focus on apostolic succession as a historical and theological foundation for Church authorityRecognition of cultural and linguistic diversity as compatible with doctrinal unity in global faith communitiesIntegration of patristic sources (early Church Fathers) into contemporary catechesis and faith formationShift toward understanding faith development as dynamic renewal rather than static adherence to formulas
Topics
Language of Faith and Doctrinal FormulationUnity of the Church Across CulturesApostolic Succession and Church AuthoritySacred Scripture vs. Sacred TraditionDevelopment of DoctrineHypostatic Union (Jesus as Fully Human and Fully Divine)Trinity (One God in Three Persons)Role of the Church as Mother and TeacherChurch Councils and Doctrinal DecisionsNicene Creed and Apostles' CreedDeposit of FaithHoly Spirit's Action in the ChurchConversion and Spiritual RenewalEarly Church Fathers and Patristic TraditionGentile Inclusion in the New Covenant
Companies
Ascension
Produces and distributes the Catechism in a Year podcast and publishes the Ascension edition of the Catechism with fo...
People
Father Mike Schmitz
Hosts and narrates the daily Catechism in a Year podcast, providing theological commentary and spiritual guidance.
Saint Thomas Aquinas
Medieval theologian quoted for his teaching that faith terminates in realities, not propositions.
Saint Irenaeus of Lyon
Early Church Father (130-202 CE) cited extensively for teachings on Church unity and apostolic tradition across cultu...
Saint Polycarp
Early Church Father who was a direct disciple of John the Apostle and ordained Saint Irenaeus.
John the Apostle
Apostle of Jesus whose direct discipleship of Polycarp establishes apostolic succession lineage.
Saint Paul
Apostle who wrote to Timothy calling the Church the 'pillar and bulwark of truth.'
Saint Matthias
Apostle chosen to replace Judas, demonstrating early Church's practice of apostolic succession.
Quotes
"We do not believe in formulas, but in those realities they express, which faith allows us to touch."
Saint Thomas Aquinas (quoted by Fr. Mike Schmitz)Early in episode
"The believer's act of faith does not terminate in the propositions, but in the realities which they express."
Saint Thomas AquinasCatechism paragraph 170
"Indeed, the church, though scattered throughout the whole world, even to the ends of the earth, having received the faith from the apostles and their disciples, guards this preaching and faith with care, as dwelling in but a single house."
Saint Irenaeus of LyonCatechism paragraph 173
"For though languages differ throughout the world, the content of their tradition is one and the same."
Saint Irenaeus of LyonCatechism paragraph 174
"Father, may they be one. May they be one, as you and I are one."
Jesus Christ (quoted by Fr. Mike Schmitz from the Last Supper high priestly prayer)Mid-episode discussion
Full Transcript
Hi, my name is Father Mike Schmitz and you're listening to the Catechism in a Year podcast, where we encounter God's plan of sheer goodness for us, revealed in Scripture, and passed down through the tradition of the Catholic faith. The Catechism in a Year is brought to you by Ascension. In 365 days, we will read through the Catechism of the Catholic Church, discovering our identity in God's family as we journey together toward our heavenly home. It is day 24. We're reading from paragraphs 170 to 175. As always, I'm using the Ascension edition of the Catechism, which includes the foundations of faith approach. You can follow along in that version or in any recent version of the Catechism of the Catholic Church. You can also download your Catechism in a Year reading plan by visiting ascensionpress.com slash C-I-Y. That's Catechism in a Year, C-I-Y. That's what that stands for. You're like, wait, no way. Yeah, way. Lastly, you can click follow or subscribe in your podcast app for daily notifications. This is the kind of the conclusion of this article, the article we believe. Remember yesterday, two days ago was I believe. Yesterday was we believe. Here we are concluding that. We do have the in brief tomorrow. After tomorrow, pretty incredible, pretty exciting. We get to launch into section two of what we believe in that creed, looking at the creed, essentially, which is pretty neat. Today, we get to read a paragraph 170 to 175. So let's say a prayer. Father in heaven, I give you praise and glory. We thank you so much for bringing us to this moment. We thank you for the fact that you've passed on your word, you've passed on your revelation of yourself to us through the church. Oh God, we also know that we don't simply believe in formulas. We believe in the realities that those formulas express. We know we don't believe in the idea of you as Father and as Son and as Holy Spirit. We believe in the reality. You are Father. You are Son. You are Holy Spirit. You don't believe merely in the idea that you've came to save us from our sins, but in the reality that you have done this and you continue to do this by sending out your Holy Spirit and meeting us ever new with your mercy every morning. So Lord, help us to continue to recognize that you're not merely an idea, you're a reality itself. You are being itself. Help us to be aware of your reality. Help us to be aware of your being. Help us to be aware of you this day and every day. In Jesus' name we pray, amen. In the name of the Father, and of the Son, and of the Holy Spirit. As I said, it is day 24 reading paragraphs 170 to 175 talking about the language of faith and the fact that there is only one faith when it comes to Christianity. Although there are many claimants, people who organizations, groups who might claim this truth about Jesus, the truth about what what Christians would believe recognize that they're truly ultimately though is only one faith in which we profess together, God willing, uniting our hearts and our minds to what God has revealed once again. Day 24, paragraphs 170 to 175. The language of faith. We do not believe in formulas, but in those realities they express, which faith allows us to touch. As St. Thomas Aquinas stated, the believer's act of faith does not terminate in the propositions, but in the realities which they express. All the same, we do approach these realities with the help of formulations of the faith which permit us to express the faith and to hand it on, to celebrate it in community, to assimilate it, and live on it more and more. The church, the pillar and bulwark of truth, faithfully guards the faith which was once for all delivered to the saints. She guards the memory of Christ's words. It is she who from generation to generation hands on the apostles confession of faith. As a mother who teaches her children to speak and so to understand and communicate, the church, our mother teaches us the language of faith in order to introduce us to the understanding and the life of faith. Only one faith. Through the centuries, in so many languages, cultures, peoples and nations, the church has constantly confessed this one faith, received from the one Lord transmitted by one baptism and grounded in the conviction that all people have only one God and Father. St. Irenaeus of Lyon, a witness of this faith, declared, Indeed, the church, though scattered throughout the whole world, even to the ends of the earth, having received the faith from the apostles and their disciples, guards this preaching and faith with care, as dwelling in but a single house. And similarly, believes as if having but one soul and a single heart, and preaches, teaches and hands on this faith with a unanimous voice, as if possessing only one mouth. St. Irenaeus further declared, For though languages differ throughout the world, the content of their tradition is one and the same. The churches established in Germany have no other faith or tradition, nor do those of the Iberians, nor those of the Celts, nor those of the East, of Egypt, of Libya, nor those established at the center of the world. The church's message is true and solid, in which one and the same way of salvation appears throughout the whole world. Finally, Irenaeus declares, We guard with care the faith that we have received from the church, for without ceasing, under the action of God's spirit, this deposit of great price, as if in an excellent vessel, is constantly being renewed and causes the very vessel that contains it to be renewed. Okay, so there we are, a day 24 paragraphs 170 to 175. The conclusion of this response, we have to, I want to highlight at least a couple things. The first is the language of faith. One of the things that I find fascinating is this paragraph 170 for years. I mean, I don't know, maybe 20 years, maybe even more than 20 years. I have come back to this line. We do not believe in formulas, but in those realities they express, which faith allows us to touch. There is something so powerful about that because you know, we stand up every single Sunday and we recite the Nicene Creed, right? We talked about that yesterday. We also at times recite the Apostles Creed. We say the Creed and the reality of course is, I can say, I believe in one God, the Father Almighty, Creator of heaven and earth, et cetera, et cetera. We'll talk about that more tomorrow. Sorry, the day after that. But I'm not saying that I believe in these words, right? I'm not saying I believe in the formulation. I believe the formulation, right? The formulation is true. The words are accurate. But I believe in the reality that they express. I think that's an important distinction to make. One of the things we're going to talk about as the year goes on is we're going to talk about what we have already mentioned even here, the development of doctrine and the recognition that as our understanding grows, right? Remember, faith seeking understanding. As our understanding grows, as our faith deepens, there might be a more unique way we can express the truth about the same reality. Now, again, we believe the formula, but we don't believe in the formula. But in the reality they express, the reality they are conveying and allow it, that faith again allows us to touch. So we, you know, I mean, think of any of the complicated ways in which we're trying to understand what's the nature of Jesus being fully human and fully divine. That's called the hypostatic union. Like, what is it that Jesus is one divine person with two natures, a divine nature and a human nature? So we say that, okay, he's a, he's one person with two natures. Like, okay, that formula of saying that Jesus is one divine person with a divine and human nature is a formula trying to give us the ability to express and capture and convey to others what we believe about Jesus. But if we were to say that I understand that, or I fully grasp the depth of what that means, we recognize that, no, I don't, I don't understand what that really means. Or to assert that, yeah, God is one in his unity and his being, he's one. But he's also Father, Son and Holy Spirit, three divine persons. Okay, again, that formula communicates a deep and profound truth. But I don't believe in the formula. I believe the formula. I do believe in God the Father. I do believe in God the Son. I do believe in God the Holy Spirit. Hope that makes sense. And again, because those formulas, well, they're not the end of themselves, they allow us to express and approach the realities. They allow us to convey them. They allow us to dive more deeply into the realities that they're trying to convey to us. And again, I want to clarify that it is absolutely important that we have these formulas. We need the formulas because they lead to the proper understanding of the realities. Without them, without the formulas, we can fall into grave error. Therefore, the formulas are actually indispensable in our faith. Like, we can't go without them, because they play an essential role in knowing the truth of the realities that they express. So moving on, we recognize the role of the church then, that the church's role is to faithfully guard the faith, which was once for all delivered to the saints. That is so important. Remember, we talked about this, how St. Paul had written to Timothy and he said, he called the church the pillar and bulwark of the truth. In that declaration is very important, especially for our brothers and sisters who say that, no, scripture is the only source of God's revelation. We'd recognize that, okay, well, that revelation, that sacred scripture, the Holy Bible, the Word of God, calls the church the pillar and bulwark of truth, which is very, very important. And because the church faithfully guards the faith. She guards the memory of Christ's words. And because that memory, we talked about how the church is mother, not in the same way that God is father, but the church is mother in the sense that, again, she continues to teach us. It's through the church that we're handed on each one of life. It's from God, but it's through the church that we're given that eternal life. And as a mother, who teaches our children to speak and so to understand and communicate, the church, our mother, teaches us the language of faith in order to introduce us to the understanding and life of faith. And that's just so vastly important. Now, at the end, the last four paragraphs, 172 to 175, most of them, well, 173, 174, 175, those paragraphs are extended quotes from a man named Saint Irenaeus of Lyon. And this is so important. Saint Irenaeus of Lyon, he was a disciple of a man named Saint Polycarp, who was a direct disciple of a man named John the Apostle. This is really, really important. So Saint Irenaeus of Lyon, he was around the years 130 to 202, so right at the very beginning. Now, we're talking about early church fathers, he's an early church father. And again, with a direct connection to John the Apostle, one of the things we've established, or we've tried to, at least assert, has been the reality of apostolic succession. The fact that here's the church, where here's the apostles, like Jesus, where I gathered the 12 apostles around him, it says to send them out. Judas betrayed, so they replaced him with Saint Matthias. And so those 12 are sent out. And consistently, as those 12 went out, they would ordain other men who would be there, ultimately, their successors, right? They would lay their hands on them, invoke the Holy Spirit, and essentially, ordain them as Jesus had ordained them. And one of the things we recognize is that unity and apostolic succession, that we can go all the way back to Jesus himself, is, I would say it's essential. But also, what we can see is it's historical. Here's Saint Irenaeus, from 130 to 202, who was himself ordained by Polycarp, who was himself ordained by John the Apostle, who himself was ordained by Jesus Christ. It's him who says, yep, the church, even though scattered throughout the whole world, has received the faith from the apostles, guards with care, as dwelling in a single house. Similarly, here's the quote, believes as if having but one soul and a single heart, preaches, teaches, and hands on this faith with a unanimous voice, as if possessing only one mouth. You know, Jesus, at the Last Supper, he has a long, high priestly prayer. And part of his high priestly prayer is, Father, may they be one. May they be one, as you and I are one. And here is Saint Irenaeus, who's saying, yeah, that's one of actually the marks, one of the marks of the church is, it's one, one soul, single heart, in a single house, unanimous voice, as if possessing only one mouth. He goes on to say in paragraph 174, for the languages differ throughout the world. The content of the tradition is one and the same. And he goes in contrast, like the church in Germany and the church of the Iberians, right, in the Iberian Peninsula, like Spain, in Portugal, those of the Celts, those of the east of Egypt, of Libya, are also those established at the center of the world. They're not different, different languages, different cultures, different customs, but the church's message is true and solid in which one and the same way of salvation appears throughout the whole world. And that is so vastly important. Now, I think we're so used to seeing division among Christians that we think, well, that's just, that's just how things are. That's not how things are. That from the very beginning, the church has had to fight for unity. And when I say fight, I do not mean some of the broken ways in which churches and Christians have fought for unity in terms of persecution. What I mean is, having to fight for ideas, having to fight for the truth, having to stand for and really wrestle with each other over, okay, so how are we going to live out? How are we going to express? How are we going to understand this faith? That's part of what the church councils have been all about. And we know that that is reality because all the way back in the Acts of the Apostles, the church had to gather in that first church council of Jerusalem and answer the question, so what about these people who are not Jewish? What about Gentiles who are not brought into the Old Covenant? Can we just bring them into the New Covenant? So the church from the very beginning has had to come together, again, not disparately, not separately, has had to come together, invoke the Holy Spirit and really wrestle with these big questions. But the answer that they've come to about these big questions has been passed on, has been formulated and taught throughout the whole world so that we have this one united faith, one church. Because of that, paragraph 175, we guard with care the faith we've received from the church for without ceasing under the action of God's spirit. Remember, God does this, this deposit of great price as if in an excellent vessel is constantly being renewed and causes the very vessel that contains it to be renewed. One thing that we can recognize as Christians, as Catholic Christians, is that we are constantly in need of renewal. We're constantly in need of conversion. We're constantly needing to come back to the Lord and say, okay, God, what am I missing? What are my blind spots? Where do I need to grow? Where do I need to understand you? Where do I need to say yes to you? And that's our prayer today, is just, okay, how can I submit once again to the invitation of the church to come back to the Lord? How can I submit once again to the teaching of the church and say, okay, Lord, I don't have all the answers. Your church is going to guide me into all truth by the power of your Holy Spirit. Help me today. Help me today, not just so I can know more about you, but so that in knowing you, I can love you better, I can follow you better, and in knowing you, I can be renewed. And that's the whole thing, to be renewed by the truth of the gospel, by the truth of the Holy Spirit, by the truth that the church continues to proclaim throughout the world. So we pray for that. I am praying for you. Please pray for me. My name is Father Mike. I cannot wait to see you tomorrow. God bless.