The Four Marks of the Catholic Church and Why They Matter for Our Families
Every Sunday at Mass, Catholics profess these words in the Nicene Creed: “I believe in one, holy, catholic and apostolic Church.” We may have recited these words hundreds of times without stopping to consider their meaning. Yet they express four wonderful truths about the Church Jesus Christ founded. They tell us what the Church is, how we can recognize her, and why we can trust her to lead us toward eternal life.
The Catechism of the Catholic Church calls these characteristics the Four Marks of the Church. It teaches that they are inseparably linked because they come from Christ himself. The Church did not invent these characteristics, nor did she gradually acquire them through human effort. Christ established his Church as one, holy, catholic, and apostolic, and the Holy Spirit continues to preserve her in these gifts. Understanding them helps us recognize the Church founded by Jesus Christ rather than choosing a religious community according to our personal preferences.
For me, learning about these four marks was one of the strongest reasons for entering the Catholic Church. They answered questions that had troubled me throughout my Protestant upbringing. More importantly, they helped me recognize something I had never fully understood: Jesus Christ did not leave his followers to determine the Christian faith independently. He established a Church through which his teaching, sacraments, and pastoral authority would continue throughout history.
My Journey from Protestantism to the Catholic Church
I grew up as the daughter of a Protestant pastor, and religion was an important part of our family life. My father loved the Bible, and I grew up familiar with the Scriptures and Christian teaching. Nevertheless, my childhood exposed me to many difficulties within Protestant Christianity. I witnessed disagreements between church members, conflicts among church leaders, and congregations dividing over religious questions. Sometimes, our family worshiped at home because my father could not find a local church whose teachings he could accept.
When we moved to a new area, we had to search for another church that agreed with our beliefs. Traveling presented similar difficulties because our religious community was usually associated with a particular congregation. We could not necessarily attend another church and expect to find the same teachings or form of worship. I also witnessed the painful consequences of serious moral failures among pastors, including adultery and removal from ministry. These experiences left me with questions about the nature of the Church and the authority of those who taught the Christian faith.
If Jesus founded one Church, why were there so many different churches? If Christians all believed in the Bible, why did they disagree about its meaning? Who possessed the authority to settle these disagreements? Most importantly, how could an ordinary Christian know which church taught the truth? These were not merely academic questions for me because I had witnessed the consequences of religious division throughout my childhood.
When my husband and I entered the Catholic Church, I was 31 years old and the busy mother of five little children. I did not have hours to devote to studying theology or reading the great works of the Church. My husband devoted considerable time to studying the Bible, the Catechism, and the writings of the Doctors of the Church, and he shared what he learned with me. Through his study and teaching, I began to understand the Catholic faith and recognize the Church Jesus Christ had established.
My own education in the faith developed gradually through the ordinary responsibilities of family life. I learned from the Baltimore Catechism as I taught our children, often learning the lessons alongside them. As our family continued homeschooling through the Classical Liberal Arts Academy, I grew in understanding by reading lessons, discussing them, and helping our children with their studies. I also learned through participating in the life of the Church, attending Mass, receiving the sacraments, and finding small opportunities to read and study.
Early in our conversion, my husband introduced me to the Liturgy of the Hours, the daily prayer of the Church. Through the Psalms, Scripture readings, and prayers, I became familiar with the voice of the Church at prayer. The Rosary also became an important part of my spiritual life, drawing my attention to the mysteries of Christ’s life through the Blessed Virgin Mary. Gradually, the Catholic faith became more deeply rooted in my mind and heart through prayer, study, teaching, and daily practice.
Looking back, I recognize how beautifully God provided for my education in the faith through my vocation as a wife and mother. I did not need to separate my religious education from my family responsibilities. Much of my learning took place while fulfilling those responsibilities, especially as I taught our children. This is an encouragement for homeschooling mothers who desire to understand the Catholic faith but have little time for independent study. We can grow in knowledge and love of the Church as we help our children grow in the same knowledge and love.
Among the truths I gradually came to appreciate, the Four Marks of the Church were especially meaningful. They revealed a Church that did not depend upon the opinions of an individual pastor or congregation. Instead, the Catholic Church claimed to possess the faith entrusted by Jesus Christ to the Apostles and preserved throughout the centuries. To understand this claim, we must examine what Scripture and the Church herself teach about each of the four marks.
The Church Is One Because Jesus Christ Founded One Church
Before his Passion, Jesus prayed for his disciples and for those who would believe in him through their preaching. In the Gospel of John, he prayed to the Father, saying, “so that they may all be one” (John 17:21). He continued by asking that his followers might share in the unity of the Father and the Son, so that the world might believe that the Father had sent him. This prayer reveals that Christian unity is not merely a desirable arrangement or a practical convenience. It belongs to Christ’s intention for the Church and serves as a witness to the truth of his divine mission.
St. Paul teaches the same truth in his Letter to the Ephesians. He reminds Christians that there is “one Lord, one faith, one baptism” (Ephesians 4:5). In the same passage, he urges believers to preserve the unity of the Spirit through the bond of peace. These words show that the unity of the Church includes a common faith and sacramental life, not merely friendly relations among Christians. Christ calls his followers into one body because they belong to one Lord.
The Catechism explains that this unity comes from the very nature of the Church. In paragraph 813, it teaches that the Church is one because of her source, her founder, and her soul. Her source is the unity of the Blessed Trinity, her founder is Jesus Christ, and her soul is the Holy Spirit. Therefore, the unity of the Church is not something that Christians can create through human agreement alone. It is a supernatural gift that comes from God and must be faithfully preserved.
The Church also possesses visible bonds of unity. The Catechism identifies these bonds as the profession of one faith, the common celebration of divine worship, and apostolic succession. Catholics throughout the world profess the same essential doctrines, receive the same sacraments, and remain in communion with the pope and bishops. These bonds unite Catholics across differences of language, nationality, culture, and personal opinion. They also distinguish the unity of the Catholic Church from a general sense of friendship among people who identify themselves as Christians.
Christ Established Authority to Preserve His Church
One of the greatest questions I had known as a Protestant concerned the authority to settle religious disagreements. Christians could study the same Bible and arrive at different conclusions about important doctrines. One pastor might teach something that another pastor rejected, while members of a congregation might disagree with both. When these disagreements became serious, the result could be another church division. I had witnessed this pattern often enough to wonder how Christ intended his followers to preserve the unity for which he prayed.
The Gospel of Matthew provides an important answer. After Peter confessed that Jesus was the Messiah and Son of the living God, Jesus declared, “upon this rock I will build my church” (Matthew 16:18). He then promised Peter the keys of the kingdom of heaven and the authority to bind and loose. These words reveal that Christ intended his Church to possess a visible foundation and genuine authority. The Church would not depend entirely upon the private interpretations of individual believers.
Christ also gave Peter a particular responsibility for strengthening and shepherding his brethren. In Luke’s Gospel, Jesus told Peter that he had prayed for his faith and instructed him to strengthen the others after his return (Luke 22:31–32). Following the Resurrection, Jesus entrusted Peter with the care of his sheep (John 21:15–17). These passages help explain the Catholic teaching concerning the pastoral authority of Peter and his successors. The pope serves the unity of the Church by exercising the office entrusted to Peter.
This authority does not mean that the pope or bishops can invent new doctrines according to their personal opinions. The Second Vatican Council explains the relationship between divine revelation and Church authority in Dei Verbum. It teaches that the Magisterium is not above the Word of God but serves it, faithfully guarding and explaining what has been handed down. Therefore, the Church’s teaching authority exists to preserve the faith entrusted by Christ to the Apostles. Catholics are not required to invent Christianity anew or decide every question of doctrine independently.
The Church has experienced disagreements, scandals, and even schisms throughout her history. Nevertheless, these human failures have not destroyed the essential unity Christ gave her. The Catechism teaches that the Church’s unity is something she can never lose, although divisions among Christians wound the visible expression of that unity. Catholics must therefore work for reconciliation, respect legitimate authority, and remain faithful to the truth. When difficulties arise, our responsibility is to seek the good of the Church rather than treating separation as the ordinary solution to disagreement.
The Saints Show Us How to Remain Faithful
St. Catherine of Siena provides a beautiful example of love for the Church during a time of serious difficulty. During the fourteenth century, the popes had been residing in Avignon, France, rather than Rome. Political conflicts and spiritual problems troubled the Church, and St. Catherine recognized the need for reform. She wrote courageously to Pope Gregory XI, urging him to return to Rome and fulfill his pastoral responsibilities. Her words were sometimes forceful, yet they arose from her deep love for Christ and his Church.
St. Catherine did not believe that the sins or weaknesses of Church leaders justified abandoning the Church. Instead, she sought to correct what was wrong while remaining faithful to the authority Christ had established. Her example teaches us that loyalty does not require pretending that every Catholic behaves well or that every decision made by a Church leader is wise. Genuine loyalty seeks the truth and the good of the Church, even when doing so requires courage. The saints understood that reform must remain faithful to the Church’s divine foundation.
This is an important lesson for our children because they will eventually encounter disagreements and disappointing behavior among Catholics. We should teach them to distinguish between the Church established by Christ and the sins of her individual members. We can also teach them to seek correction and reconciliation through truth, justice, and charity. The unity of the Church does not require silence in the face of wrongdoing, but it does call us to remain faithful to Christ. When we profess that the Church is one, we acknowledge the unity he established and our responsibility to preserve it.
The Church Is Holy Because Jesus Christ Is Holy
The second mark of the Church sometimes raises an important question. How can the Church be holy when so many of her members are sinners? Church history contains examples of serious moral failures, including failures among priests, bishops, and popes. We also recognize sin and weakness in our own lives. If holiness depended upon the personal perfection of every Catholic, the Church could never claim to be holy.
Scripture teaches that the holiness of the Church comes from Jesus Christ. In his Letter to the Ephesians, St. Paul compares Christ’s love for the Church to the love of a husband for his wife. He explains that Christ loved the Church and gave himself for her so that he might sanctify her (Ephesians 5:25–27). The Church is holy because Christ belongs to her as her Head and continually sanctifies her through his grace. Her holiness is therefore a gift from God rather than an achievement of her members.
The Second Vatican Council teaches this truth in Lumen Gentium, explaining that the Church is holy because Christ, the Son of God, loved her and gave himself for her sanctification. The Council also teaches that all Christians are called to holiness, regardless of their state in life. Holiness is not reserved for priests, religious, or those who can devote many hours to prayer and study. Married couples, parents, children, workers, and students are all called to become saints. Each person must respond to God’s grace through the duties and opportunities of his particular vocation.
This teaching should encourage every Catholic mother. Our daily responsibilities may appear ordinary, but they provide countless opportunities to practice the virtues. We can grow in patience while caring for a difficult child, in charity while serving our families, and in humility when acknowledging our mistakes. We can practice justice by fulfilling our responsibilities and prudence by making wise decisions for our households. These ordinary actions become part of our growth in holiness when we perform them in cooperation with God’s grace and out of love for him.
The Church Provides the Means of Holiness
Jesus did not establish his Church as a gathering place for people who had already achieved perfection. He came to call sinners to repentance and offer them salvation. When the Pharisees criticized him for eating with tax collectors and sinners, Jesus answered that he had come to call sinners rather than the righteous (Matthew 9:10–13). His words remind us that the Church exists to bring the saving grace of Christ to those who need it. We enter the Church not because we have already become saints, but because Christ calls us to become holy.
The sacraments are especially important in this work of sanctification. Through Baptism, God cleanses us from sin and gives us new life in Christ. Through the Eucharist, we receive the Body and Blood of our Lord, who nourishes our souls and strengthens our union with him. Through the Sacrament of Penance, Christ forgives sins committed after Baptism and restores us to his friendship. These gifts demonstrate that the holiness of the Church comes from Christ’s continuing action among his people.
The Catechism explains in paragraph 827 that the Church embraces sinners and therefore continually needs purification. “The Church, clasping sinners to her bosom, at once holy and always in need of purification, follows constantly the path of penance and renewal.” This teaching helps us understand how the Church can be holy while her members remain imperfect. Sin does not become good simply because a Catholic commits it, and serious wrongdoing must never be excused in the name of loyalty to the Church. Instead, Catholics must acknowledge evil, seek justice, and work for genuine reform. The holiness of the Church calls her members to repentance rather than providing an excuse for their sins.
The lives of the saints demonstrate the transforming power of God’s grace. St. Augustine spent much of his youth pursuing worldly pleasures and embracing religious errors. His mother, St. Monica, prayed persistently for his conversion and continued to hope in God’s mercy. Eventually, Augustine received Baptism and became one of the greatest bishops and teachers in Church history. His life reveals how God can transform a sinner into a saint through grace, repentance, and perseverance.
St. Monica’s example is especially meaningful for mothers. She could not control her son’s decisions or force him to accept the Catholic faith. Nevertheless, she prayed for him, instructed him, and remained faithful through many years of uncertainty. Her perseverance reminds us that the spiritual formation of our children requires both our efforts and our trust in God. We must teach them faithfully, provide good examples, and pray for their salvation while remembering that grace comes from God.
The Church’s holiness is therefore both a gift and a calling. Christ has given his Church the means necessary for our sanctification, and he invites every member to cooperate with his grace. As mothers, our greatest responsibility is not simply to raise well-behaved children or prepare them for worldly success. We are helping them become saints, and we must seek holiness alongside them. When we profess that the Church is holy, we acknowledge the holiness of Christ working within her and the holiness to which he calls us all.
The Church Is Catholic Because She Is for All People
The third mark of the Church is expressed in the word catholic, which means universal or according to the whole. This characteristic comes directly from the mission Jesus entrusted to his Apostles. After his Resurrection, Christ commanded them to “make disciples of all nations” (Matthew 28:19). He instructed them to baptize and teach the people, promising to remain with them until the end of the age. Therefore, the Church was never intended to serve only one nation, language, culture, or group of people.
The Catechism explains in paragraph 830 that the Church is catholic in two senses. First, she is catholic because Christ is present in her, and she possesses the fullness of the means of salvation. Second, she is catholic because Christ sends her to proclaim the Gospel throughout the whole world. These two meanings belong together because the Church possesses the gifts of Christ in order to share them with all humanity. Her universal mission flows from the fullness of truth and grace entrusted to her.
This characteristic was especially meaningful to me because of my Protestant upbringing. When our family moved, we had to search for another congregation whose teachings agreed with our beliefs. Traveling presented similar difficulties because our religious community was generally associated with a particular congregation or denomination. We could not assume that another Protestant church would share our understanding of Scripture or our form of worship. The Catholic Church offered something different because her essential faith and sacramental life were not confined to one congregation.
A Catholic family can travel from the United States to France, Kenya, the Philippines, or Brazil and find the same essential Catholic faith. The language, music, customs, and local traditions may differ, and Catholics may worship according to different liturgical rites. Nevertheless, Catholics throughout the world remain united through the same faith, sacraments, and communion with the pope and bishops. There is something wonderful about entering a Catholic church far from home and recognizing the celebration of the Holy Eucharist. Even when the language is unfamiliar, we belong to the same worldwide communion.
The universal mission of the Church was revealed beautifully at Pentecost. The Acts of the Apostles tells us that people from many nations heard the Apostles proclaiming God’s mighty works in their own languages (Acts 2:1–11). This event demonstrated that the Gospel was intended for all peoples rather than one nation alone. St. Paul later taught the Galatians that distinctions of race, social condition, and sex do not prevent Christians from sharing in their unity in Christ (Galatians 3:26–28). Through Baptism, people from every nation are invited to become members of God’s family.
The Book of Revelation also presents a beautiful image of the Church’s universal mission reaching its fulfillment. St. John describes a great multitude standing before the throne of God, drawn from every nation, race, people, and tongue (Revelation 7:9). This vision reveals the heavenly destiny toward which the Church directs her missionary work. The Church proclaims the Gospel throughout the world because Christ desires the salvation of all people. Her catholicity is therefore not merely a matter of geography but expresses the universal scope of God’s saving plan.
For homeschooling families, this mark provides wonderful opportunities for education. We can study the lives of saints from different countries and centuries, learning how the same Catholic faith has flourished among many peoples. We can explore the history of Catholic missions and the sacrifices of missionaries who carried the Gospel throughout the world. We can also teach our children that no race, nationality, language, or social position prevents someone from entering the Church. Most importantly, we can help them understand that the Catholic faith is not the possession of one culture because Jesus Christ came to save the world.
The Church Is Apostolic Because She Comes from the Apostles
The fourth mark of the Church is apostolic, a word that comes from the Greek word for someone who is sent. Jesus chose twelve Apostles and entrusted them with a particular mission. They received his teaching, witnessed his Resurrection, and proclaimed the Gospel after Pentecost. The Catholic Church is apostolic because she remains connected to these Apostles through her foundation, her teaching, and her pastoral leadership. She preserves the faith Christ entrusted to them and continues their mission through the bishops who succeed them.
St. Paul explains this foundation in his Letter to the Ephesians. He teaches that Christians belong to the household of God, built upon the foundation of the Apostles and prophets, with Christ Jesus himself as the cornerstone (Ephesians 2:19–22). This image reveals that the Church possesses an established foundation rather than depending upon the religious opinions of each generation. Christ remains the cornerstone because he is the source of the Church’s life and authority. The Apostles form her foundation because Christ entrusted them with the responsibility to proclaim and preserve his teaching.
The New Testament also reveals how the Apostles prepared for the continuation of their ministry. After Judas betrayed Jesus and died, the remaining Apostles chose Matthias to take his place among the Twelve (Acts 1:15–26). St. Paul later instructed Timothy to entrust his teaching to faithful people who would be capable of teaching others (2 Timothy 2:2). He also instructed Titus to appoint presbyters in the communities entrusted to his care (Titus 1:5). These passages show that the Apostles understood the importance of preserving Christian teaching and pastoral leadership beyond their own lifetimes.
This continuation of apostolic ministry is called apostolic succession. Bishops succeed the Apostles in their pastoral office through the sacrament of Holy Orders. They receive the responsibility to teach, sanctify, and govern the faithful in communion with the successor of Peter. The Catechism explains in paragraph 857 that the Church is apostolic because she was founded on the Apostles, preserves their teaching, and continues to receive instruction and guidance through their successors. Therefore, apostolic succession provides a visible connection between the Catholic Church today and the Church established by Jesus Christ.
The Early Christians Recognized Apostolic Succession
The writings of the early Church Fathers provide important evidence that apostolic succession was recognized long before the divisions of later Christian history. St. Irenaeus, a bishop of the second century, defended the Christian faith against teachers who claimed to possess secret religious knowledge. He argued that authentic Christian teaching could be recognized through the churches founded by the Apostles and the bishops who succeeded them. In his work Against Heresies, he described the succession of bishops in the Church of Rome and appealed to the faith they had faithfully preserved. His argument was that the true Christian faith had been publicly transmitted through the Church rather than secretly discovered by individual teachers.
St. Irenaeus was especially well placed to understand the importance of apostolic tradition. He had known St. Polycarp, who had received instruction from the Apostles and those who had known them. Through this connection, Irenaeus could testify to the continuity of Christian teaching from the earliest generations. His writings demonstrate that the early Christians did not regard Scripture as something each believer should interpret independently of the Church. Instead, they understood the Scriptures within the faith handed down through the Apostles and their successors.
The Second Vatican Council teaches the same principle in Dei Verbum. The Council explains that Sacred Scripture and Sacred Tradition together form one sacred deposit of the Word of God entrusted to the Church. The Magisterium has the responsibility to guard and faithfully interpret this deposit, always remaining subject to divine revelation. This arrangement protects the Church from abandoning the faith whenever new religious opinions become popular. It also allows Catholics to receive Christian teaching with confidence because its authority ultimately comes from Jesus Christ.
As homeschooling parents, we understand the importance of trustworthy teachers. We would not want our children to learn mathematics from someone who invented his own rules or history from someone who changed facts according to personal preference. How much more important is reliable teaching about God, salvation, and eternal life? Christ did not leave his followers without guidance, nor did he require every Christian to determine the meaning of divine revelation independently. He established his Church upon the Apostles and promised to remain with her until the end of the age.
This apostolic foundation should give Catholic families great confidence. When we teach our children the faith, we are not simply passing along religious customs that our families happen to prefer. We are transmitting the teachings of Jesus Christ as preserved by the Church through the centuries. We can study Scripture, the Catechism, and the writings of the saints with the assurance that the Church provides a trustworthy guide. When we profess that the Church is apostolic, we acknowledge that our faith comes from Jesus Christ through the Apostles rather than from the opinions of later religious teachers.
The Four Marks Help Us Recognize the Church Jesus Founded
When we consider the Four Marks together, we begin to understand their importance in identifying the Church Jesus Christ established. Many Christian communities possess admirable qualities, including devotion to Scripture, prayer, charitable works, and sincere love for Jesus Christ. The Catholic Church recognizes these gifts wherever they genuinely come from Christ. The Second Vatican Council teaches that baptized Christians outside full communion with the Catholic Church are our brothers and sisters in Christ. It also acknowledges that elements of truth and sanctification exist within their communities.
This teaching is especially important for those of us who grew up Protestant. We need not deny the good we received from our families, pastors, and Christian communities. I remain grateful for the love of Scripture that I received during my Protestant upbringing and for the many Christians who sincerely sought to serve God. Nevertheless, recognizing these genuine gifts does not require us to overlook important differences in doctrine, worship, and authority. The Catholic Church teaches that the Church Christ established subsists in the Catholic Church, governed by the successor of Peter and the bishops in communion with him.
The Four Marks help us understand this claim because they direct our attention toward the objective characteristics of the Church. When considering whether a particular religious community teaches the truth, we should not begin by asking whether we like the pastor, enjoy the music, or feel comfortable among the congregation. These matters may influence our experience of worship, but they do not establish whether a religious community possesses the marks Christ gave his Church. Instead, we should examine its unity, holiness, catholicity, and apostolic foundation. These questions lead us beyond personal preferences and toward the Church established by Jesus Christ.
Loving the Church Means Remaining Faithful Through Difficulties
One of the most important lessons we can teach our children is that we should love the Church because she belongs to Jesus Christ. However, loving the Church does not mean refusing to acknowledge the faults of her members or pretending that difficulties do not exist. St. Catherine of Siena confronted serious problems in Church leadership, while St. Augustine defended Catholic unity against religious division and error. St. Monica persevered in prayer through years of suffering and uncertainty about her son’s spiritual condition. Each of these saints understood that genuine faithfulness requires perseverance, courage, and trust in God.
The Second Vatican Council teaches that Catholics must continually examine their lives and work for renewal within the Church. We must never confuse fidelity with silence in the face of wrongdoing, especially when innocent people have suffered harm. Sometimes love requires difficult conversations, legitimate correction, and the protection of vulnerable people. At other times, love requires patience with ordinary human weaknesses and disagreements. In every situation, Catholics must seek to act according to truth, justice, and charity.
Our children can begin learning these virtues within the family. When family members disagree, we should teach them to seek understanding, acknowledge their faults, forgive injuries, and pursue peace. Serious harm requires appropriate protection and intervention, and Christian unity never demands that someone remain in danger. Nevertheless, ordinary disagreements should not automatically lead to broken relationships or permanent divisions. The family can become a school of charity where children learn how to live faithfully within the larger family of the Church.
Teaching Our Children to Love the Church Christ Founded
When I recently taught the Four Marks of the Church to my Confirmation students, I was reminded of how wonderful these truths are. They are not merely vocabulary words to memorize for a religion test. They help answer some of the most important questions a young Christian can ask about faith, authority, and belonging to the Church. Where is the Church Jesus founded, and how can we recognize her? How can we know what Christ taught, and why should we remain Catholic when we encounter difficulties?
As homeschooling mothers, we have a beautiful opportunity to explore these questions with our children. We can open our Bibles together and read Christ’s promises to his Church. We can study the Apostles and the early Christians, learning how the faith was transmitted from one generation to another. We can introduce our children to saints who loved the Church through times of suffering, persecution, and confusion. Most importantly, we can help them understand that belonging to the Catholic Church is not simply a family custom or personal preference, but a response to Jesus Christ.
When I entered the Catholic Church as a wife and mother, I was not searching for a perfect congregation filled with perfect people. I was searching for the Church Jesus founded, and learning about the Four Marks helped me recognize her. Today, when I profess my belief in one, holy, catholic, and apostolic Church, those words remind me of the wonderful gift Christ has given us. He has not left us to wander endlessly, searching for a religious community that agrees with every personal opinion. He has given us his Church, where we can receive his grace, learn his truth, and grow together toward eternal life.
That is a gift worth understanding, cherishing, and sharing with our children.
Questions for Family Discussion and Student Reflection
- Jesus prayed that his followers would be one (John 17:20–23). What kind of unity did he desire for his Church?
- How can the Church be holy when some of her members commit serious sins? What does Scripture teach about the source of the Church’s holiness?
- Jesus commanded his Apostles to make disciples of all nations (Matthew 28:19). How does the Catholic Church continue this mission today?
- Why was it important for the Apostles to appoint successors and preserve the teachings they received from Christ?
- What can we learn from saints who remained faithful to the Church while working to correct problems within her?
- How do the Four Marks help us recognize the Church Jesus Christ founded?
Sources and Notes
- Catholic Church. Catechism of the Catholic Church. 2nd ed. Vatican City: Libreria Editrice Vaticana, 1997. Paragraphs 811–870. Read online.
- Second Vatican Council. Lumen Gentium (Dogmatic Constitution on the Church). November 21, 1964. Sections 8, 13, 18–23, 39–42. Read online.
- Second Vatican Council. Unitatis Redintegratio (Decree on Ecumenism). November 21, 1964. Sections 2–4, 6–8. Read online.
- Second Vatican Council. Dei Verbum (Dogmatic Constitution on Divine Revelation). November 18, 1965. Sections 7–10. Read online.
- United States Conference of Catholic Bishops. New American Bible, Revised Edition. Washington, DC: Confraternity of Christian Doctrine, 2011. Read online.
- Augustine of Hippo. Confessions. Books 8–9. Read online.
- Irenaeus of Lyons. Against Heresies. Book 3, chapter 3. Read online.
- Catherine of Siena. The Letters of St. Catherine of Siena. Edited and translated by Suzanne Noffke. 4 vols. Tempe, AZ: Arizona Center for Medieval and Renaissance Studies, 2000–2008.
- Thomas Aquinas. Summa Theologiae. Third Part, question 8, articles 1–6. Read online.