WASHINGTON – Pope Leo XIV has appointed Reverend Monsignor Peter Dai Bui, as Auxiliary Bishop of Phoenix. Monsignor Bui is a priest of the Diocese of Phoenix and currently serves as the diocese’s Vicar for Clergy. The appointment was publicized in Washington, D.C. on December 19, 2025, by Cardinal Christophe Pierre, apostolic nuncio to the United States.

The following biographical information for Bishop-elect Bui was drawn from preliminary materials provided to the U.S. Conference of Catholic Bishops:

Monsignor Bui was born January 11, 1970, in Phu Quoc Island, Vietnam. He studied at the Legion of Christ Minor Seminary and entered the Legion of Christ Novitiate in Cheshire, Connecticut in 1989, making his First Profession in 1991. Monsignor Bui attended the Pontifical Athenaeum in Rome, earning degrees in philosophy and theology as well as a licentiate in philosophy (2003). He was ordained to the priesthood on December 24, 2003, for the Legionaries of Christ (a religious order).

Bishop-elect Bui served as chaplain of a private Catholic school in Caracas, Venezuela, organizing mission trips to Amazonia and Medellin, Colombia (2003-2006). He was incardinated into the Diocese of Phoenix in October 2009. His pastoral assignments in the diocese have included: associate pastor of Our Lady of Guadalupe parish in Queen Creek (2007-2008); associate pastor at Christ the King parish in Mesa (2008-2010); pastor at Resurrection parish in Tempe (2010-2011); and pastor at Holy Spirit parish in Tempe (2017-2022). Bishop-elect Bui also served as an official on the Pontifical Council Cor Unum from 2011-2016. On December 16, 2014, he was named a Chaplain to His Holiness, with the title of Monsignor. Since 2022, Monsignor Bui has served as the Vicar for Clergy for the Diocese of Phoenix. He speaks English, Vietnamese, Spanish, Italian, and German.

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We speak often of Mary’s Fiat, and rightly so. Her yes stands at the center of salvation history. But Scripture gives us another yes, one that is quieter and almost hidden in the background. It is the yes of a man who receives no annunciation from an angel in broad daylight, who hears God not ... Read more

Quia fecisti nos ad Te, et inquietum est cor nostrum donec requiescat in Te.“You have made us for Yourself, O Lord, and our heart is restless until it rests in You.” With these famous opening words of the Confessions, St. Augustine frames any genuine inquiry into the nature of inner peace. The desire for inner ... Read more

On this last Sunday of Advent, our Gospel calls us to reflect on Joseph, not Mary or Jesus.  Why? Gospel (Read Mt. 1:18-24) As our time of preparation and waiting in Advent draws to a close, we find ourselves listening to St. Matthew’s account of how Joseph became an important part of the first Advent. ... Read more

Vatican City, Dec 18, 2025 / 18:28 pm (CNA).

Pope Leo XIV warned against the destructive spiral fueled by the arms race and the development of autonomous weapons, and called for an “unarmed and disarming” peace — one that springs from the resurrection of Christ — as the only answer to the world’s challenges.

“The peace of the risen Jesus is unarmed, because his was an unarmed struggle in the midst of concrete historical, political, and social circumstances,” the pontiff wrote in his message for the 59th World Day of Peace, which will be celebrated on Jan. 1, 2026. Its text was released Dec. 18 by the Holy See Press Office.

The four-page document is titled “Peace Be with You All: Towards an Unarmed and Disarming Peace,” an expression that directly echoes the first words spoken by Leo XIV after his election as the successor of Peter on May 8, when he appeared on the balcony of the Apostolic Palace to greet the faithful for the first time.

In the text, the pope lamented that, in the face of global challenges, the predominant response is an “enormous economic investment in rearmament.” In this regard, he noted that in 2024, global military spending increased by 9.4% compared with the previous year, confirming “the trend of the last 10 years.” According to the data cited, total spending reached $2.718 trillion, equivalent to 2.5% of the world’s gross domestic product.

Beyond the statistics, the pope warned of the cultural and educational consequences of this logic. He criticized the fact that schools and universities are not adequately preserving “a culture of memory” that remembers the “millions of victims” of wars ​​and lamented that, instead, educational programs are being promoted that are based on the “perception of threats,” promoting “only an armed notion of defense and security.”

The Holy Father also emphasized how technological advancements and the incorporation of artificial intelligence in the military sphere have “worsened the tragedy” of armed conflicts. He therefore warned of the risk of a growing tendency to “shirk responsibility” by political and military leaders such that “decisions about life and death are increasingly “‘delegated’ to machines.” 

In his view, this is an “unprecedented destructive betrayal” of the “legal and philosophical principles of humanism” upon which any civilization is based and safeguarded.

The pontiff did not shy away from denouncing “the enormous concentrations of private economic and financial interests” that are driving states in this direction, but emphasized that just criticizing this would not be enough “unless we also awakened conscience and critical thought” throughout society.

In his reflection, Leo XIV included an explicit warning against the religious instrumentalization of violence. The pope observed that it is part of the contemporary landscape to “to drag the language of faith into political battles, to bless nationalism, and to justify violence and armed struggle in the name of religion.” In response, he urged believers to “actively refute this, above all by the witness of their lives,” because “these forms of blasphemy profane the holy name of God.”

Therefore, he emphasized that, alongside concrete actions for peace, it is increasingly necessary to cultivate “prayer, spirituality, and ecumenical and interreligious dialogue” as authentic paths to peace and as languages ​​of encounter between traditions and cultures.

The Holy Father also warned of the risk of treating peace as a “distant ideal” and “disconnected from the concrete experience of people and the political life of nations.”

When peace is presented as something unattainable, the pope noted in the text, “we cease to be scandalized when it is denied, or even when war is waged in its name.”

According to the pontiff, there is a real risk that this logic will end up seeping into both private and public life, fueling the perception that it is almost “a fault” not to be sufficiently prepared for war, “not to react to attacks,” even going “far beyond the principle of legitimate defense.”

“It is no coincidence that repeated calls to increase military spending, and the choices that follow, are presented by many government leaders as a justified response to external threats,” Leo XIV lamented.

Indeed, he continued, “the deterrent power of military might, especially nuclear deterrence, is based on the irrationality of relations between nations, built not on law, justice, and trust but on fear and domination by force.”

Faced with this scenario, the pope proposed a different understanding of peace that “wants to dwell within us” and has the “gentle power to enlighten and expand our understanding; it resists and overcomes violence.”

‘Peace is a breath of the eternal’

“Peace is a breath of the eternal: while to evil we cry out ‘Enough,’ to peace we whisper ‘Forever,’” the pope emphasized.

The reflection included a cultural critique of the modern world, which he called “realistic” in its narratives but “devoid of hope, blind to the beauty of others,” and that forgets that “God’s grace is always at work in human hearts, even those wounded by sin.”

In this regard, the pope recalled that the path proposed by Jesus was already perplexing even for his own disciples: “The Gospels do not hide the fact that what troubled the disciples was his nonviolent response,” a path that everyone, starting with Peter, opposed, “yet the Master asked them to follow this path to the end. The way of Jesus continues to cause unease and fear.” 

The Holy Father acknowledged the discouragement experienced by people of goodwill who “have hearts ready for peace” and are overwhelmed by a feeling of “powerlessness” in the face of the increasingly uncertain course of events.

The World Day of Peace was instituted by St. Paul VI, who proposed it on Dec. 8, 1967, the solemnity of the Immaculate Conception. It was celebrated for the first time on Jan. 1, 1968, coinciding with the solemnity of Mary, Mother of God, and since then it has become an annual occasion for the Church to reflect on the great challenges of human coexistence.

This story was first published by ACI Prensa, CNA’s Spanish-language news partner. It has been translated and adapted by CNA.

Vatican City, Dec 18, 2025 / 18:28 pm (CNA).

Pope Leo XIV warned against the destructive spiral fueled by the arms race and the development of autonomous weapons, and called for an “unarmed and disarming” peace — one that springs from the resurrection of Christ — as the only answer to the world’s challenges.

“The peace of the risen Jesus is unarmed, because his was an unarmed struggle in the midst of concrete historical, political, and social circumstances,” the pontiff wrote in his message for the 59th World Day of Peace, which will be celebrated on Jan. 1, 2026. Its text was released Dec. 18 by the Holy See Press Office.

The four-page document is titled “Peace Be with You All: Towards an Unarmed and Disarming Peace,” an expression that directly echoes the first words spoken by Leo XIV after his election as the successor of Peter on May 8, when he appeared on the balcony of the Apostolic Palace to greet the faithful for the first time.

In the text, the pope lamented that, in the face of global challenges, the predominant response is an “enormous economic investment in rearmament.” In this regard, he noted that in 2024, global military spending increased by 9.4% compared with the previous year, confirming “the trend of the last 10 years.” According to the data cited, total spending reached $2.718 trillion, equivalent to 2.5% of the world’s gross domestic product.

Beyond the statistics, the pope warned of the cultural and educational consequences of this logic. He criticized the fact that schools and universities are not adequately preserving “a culture of memory” that remembers the “millions of victims” of wars ​​and lamented that, instead, educational programs are being promoted that are based on the “perception of threats,” promoting “only an armed notion of defense and security.”

The Holy Father also emphasized how technological advancements and the incorporation of artificial intelligence in the military sphere have “worsened the tragedy” of armed conflicts. He therefore warned of the risk of a growing tendency to “shirk responsibility” by political and military leaders such that “decisions about life and death are increasingly “‘delegated’ to machines.” 

In his view, this is an “unprecedented destructive betrayal” of the “legal and philosophical principles of humanism” upon which any civilization is based and safeguarded.

The pontiff did not shy away from denouncing “the enormous concentrations of private economic and financial interests” that are driving states in this direction, but emphasized that just criticizing this would not be enough “unless we also awakened conscience and critical thought” throughout society.

In his reflection, Leo XIV included an explicit warning against the religious instrumentalization of violence. The pope observed that it is part of the contemporary landscape to “to drag the language of faith into political battles, to bless nationalism, and to justify violence and armed struggle in the name of religion.” In response, he urged believers to “actively refute this, above all by the witness of their lives,” because “these forms of blasphemy profane the holy name of God.”

Therefore, he emphasized that, alongside concrete actions for peace, it is increasingly necessary to cultivate “prayer, spirituality, and ecumenical and interreligious dialogue” as authentic paths to peace and as languages ​​of encounter between traditions and cultures.

The Holy Father also warned of the risk of treating peace as a “distant ideal” and “disconnected from the concrete experience of people and the political life of nations.”

When peace is presented as something unattainable, the pope noted in the text, “we cease to be scandalized when it is denied, or even when war is waged in its name.”

According to the pontiff, there is a real risk that this logic will end up seeping into both private and public life, fueling the perception that it is almost “a fault” not to be sufficiently prepared for war, “not to react to attacks,” even going “far beyond the principle of legitimate defense.”

“It is no coincidence that repeated calls to increase military spending, and the choices that follow, are presented by many government leaders as a justified response to external threats,” Leo XIV lamented.

Indeed, he continued, “the deterrent power of military might, especially nuclear deterrence, is based on the irrationality of relations between nations, built not on law, justice, and trust but on fear and domination by force.”

Faced with this scenario, the pope proposed a different understanding of peace that “wants to dwell within us” and has the “gentle power to enlighten and expand our understanding; it resists and overcomes violence.”

‘Peace is a breath of the eternal’

“Peace is a breath of the eternal: while to evil we cry out ‘Enough,’ to peace we whisper ‘Forever,’” the pope emphasized.

The reflection included a cultural critique of the modern world, which he called “realistic” in its narratives but “devoid of hope, blind to the beauty of others,” and that forgets that “God’s grace is always at work in human hearts, even those wounded by sin.”

In this regard, the pope recalled that the path proposed by Jesus was already perplexing even for his own disciples: “The Gospels do not hide the fact that what troubled the disciples was his nonviolent response,” a path that everyone, starting with Peter, opposed, “yet the Master asked them to follow this path to the end. The way of Jesus continues to cause unease and fear.” 

The Holy Father acknowledged the discouragement experienced by people of goodwill who “have hearts ready for peace” and are overwhelmed by a feeling of “powerlessness” in the face of the increasingly uncertain course of events.

The World Day of Peace was instituted by St. Paul VI, who proposed it on Dec. 8, 1967, the solemnity of the Immaculate Conception. It was celebrated for the first time on Jan. 1, 1968, coinciding with the solemnity of Mary, Mother of God, and since then it has become an annual occasion for the Church to reflect on the great challenges of human coexistence.

This story was first published by ACI Prensa, CNA’s Spanish-language news partner. It has been translated and adapted by CNA.

ACI Prensa Staff, Dec 18, 2025 / 18:08 pm (CNA).

Pope Leo XIV enjoyed a special Christmas concert this week dedicated to him by students of the Paul VI Pontifical School in Castel Gandolfo.

ACI Prensa Staff, Dec 18, 2025 / 18:08 pm (CNA).

Pope Leo XIV enjoyed a special Christmas concert this week dedicated to him by students of the Paul VI Pontifical School in Castel Gandolfo.

During his surprise visit to the school, which has about 300 students, the Holy Father listened attentively to the children and applauded enthusiastically at the end of their concert.

The pontiff delivered an impromptu greeting to the children, who sang Christmas carols in several languages for him. “It was wonderful to hear the Christmas carols in Italian, Latin, English, and Spanish,” he said at the end of the concert, as reported by Vatican News.

“Hearing these children sing like this in all these languages ​​helps us understand how Christmas awakens in the hearts of all of us a joy, a peace, a truly important message,” he said.

The performance took place in the school gymnasium and was also attended by parents and teachers, as well as the bishop of Albano, Vincenzo Viva, and the president of the Administration of the Patrimony of the Apostolic See, Archbishop Giordano Piccinotti.

The pope thanked the school for the invitation and said the children “have brought love to everyone tonight with this beautiful music.” 

As is his custom, he referred to St. Augustine, noting that the saint from Hippo said that “‘he who loves, sings,’ because his heart truly knows what is important.”

“And God has wanted to communicate to all of us the gift of love: This is Christmas, God who wanted to draw near to us, especially to the little ones. May this spirit that we are already celebrating tonight, and in the coming days and at Christmas, and perhaps throughout the entire year, allow us to feel and live this love of Christmas,” said the Holy Father, who concluded his brief address on Dec. 16 with an invitation to “proclaim peace, love, and unity in the world.”

Pope Leo XIV, who wore an enormous smile on his face, took a few moments to greet the children and their families. They gave him a tennis racket because he plays tennis, a sport he loves and has been playing for years.

Before returning to the Vatican after his weekly visit to the papal residence in Castel Gandolfo, the pope toured the grounds of the Catholic elementary school, which was founded in 1968 by St. Paul VI and houses a relic of the saint.

This story was first published by ACI Prensa, CNA’s Spanish-language news partner. It has been translated and adapted by CNA.

Washington, D.C. Newsroom, Dec 18, 2025 / 17:48 pm (CNA).

Encouraging participation in Mass and making the sacraments more accessible can deepen fulfillment among Catholics and therefore help to keep Catholics in the faith, experts say.

A recent Pew Research Center report, “Why Do Some Americans Leave Their Religion While Others Stay?”, examined the religious switching of U.S. adults. It looked into the reasons why people stay or leave their childhood faith.

The report revealed many U.S. adults (35%) have left the religion they grew up in, but the majority of Americans (56%) still identify with their childhood religion. The survey reported that Catholics specifically continue to identify with the faith because “their religion fulfills their spiritual needs” (54%) and “they believe in the religion’s teachings” (53%).

To better understand why Catholicism fulfills spiritual needs and which teachings are most important in that process, “it’s crucial that we pay attention to what’s working,” Tom Nash, a contributing apologist for Catholic Answers, told CNA.

He highlighted a June Pew study that found practicing Catholics believe “having a personal relationship with Jesus Christ” (90%) and “receiving the Eucharist” (83%) are the most essential aspects of their faith.

The study “tracks with the Church’s teaching that the sacrifice of the Mass is ‘the source and summit of the Christian life’ (Catechism of the Catholic Church, 1324), and provides insight regarding how the Church best fulfills someone’s spiritual needs and, relatedly, which teachings are most important,” Nash said.

“Through his one paschal sacrifice of Calvary — which encompasses his passion, death, resurrection, and ascension into heaven — Jesus has redeemed the world. In addition, Jesus enables us to offer anew sacramentally and partake of his one sacrifice in the Mass, which is the New Covenant Passover Communion sacrifice,” Nash said.

Receiving the sacraments

Since the majority of Catholics say the faith fulfills their spiritual needs and they believe in the religion’s teachings, it’s “best” to highlight what meets those aspects, Nash said. Specifically, he suggested making the sacraments accessible to Catholics.

“When we make sacramental encounters more available with Our Lord Jesus Christ, an increase in Sunday Mass participation will follow accordingly,” Nash said. 

Not only is receiving the Eucharist at Mass “fundamental,” but so is “communing with our Eucharist Lord Jesus spiritually through Eucharistic adoration,” Nash said. This allows Catholics to have “a deep relationship with Our Lord; and they thus form the bedrock of Catholic belief, because they enable us to have increasing divine intimacy with Jesus, and through him with the Father and the Holy Spirit.”

“For practicing Catholics, those who are not participating in weekly Mass, and people in general to whom Christ’s Great Commission is also addressed, we need to ‘Open the doors wide to Christ. To his saving power,’” as St. John Paul II said in his inauguration Mass.

The best and most convenient way to “open the doors” is “to give Catholics and non-Catholics alike the opportunity to draw near to our Eucharistic Lord Jesus in Eucharistic adoration,” Nash said. “With the help of parish deacons and laymen, every parish in the country can open its doors for adoration several nights a week for two to three hours.”

This will allow people to “draw near to the Lord in intimate spiritual communion, whether with our Eucharistic Lord exposed in a monstrance or reposed in the tabernacle. And also open the doors on a morning or two to accommodate those who work evenings.”

“A lot of people — inactive Catholics and non-Catholics alike — are not likely to come to Mass. But if you give them an opportunity to quietly spend time with Jesus in the Blessed Sacrament when it’s more convenient for them, they will draw near,” he said.  

The sacrament of confession is also necessary. Nash suggests making confession “available five to 10 hours every week at every parish.”

“It’s not by accident that two of the most demonically oppressed priests in the last two centuries are renowned priest confessors: St. John Vianney and St. Padre Pio,” Nash said. “The devil knows the power of this great sacrament and acts accordingly in opposing it. In this way, we can ironically take a lesson from Lucifer, who despite his being ‘the father of lies’ (Jn 8:44) can’t help but tell the true in expressing his unvarnished hatred of Our Lord Jesus Christ and his Catholic Church.”

Catholics must be ‘equipped’ and ‘formed’

Among all former Catholics whom the new study looked at, it found “the most commonly cited reasons for leaving include no longer believing in the religion’s teachings, scandals involving clergy or religious leaders, or being unhappy about the religion’s teachings about social and political issues,” said Becka Alper, senior researcher at Pew Research Center, in a Dec. 17 interview with “EWTN News Nightly.”

The study reported most former Catholics are now Protestants. They reported they switched because they stopped believing in the Church’s teachings (46%), “assuming they understand them well to begin with, and because they now believe in the distinctive teachings of Protestantism of one type or another,” Nash said.  

If Catholics are equipped “to explain the faith well in a joyful manner, we can stanch the hemorrhaging from the Church,” Nash said. This will also help “remove stumbling blocks for former Catholics and never-Catholic Christians regarding the nature of the Mass, Christ’s real presence in the Eucharist, and that he also provides us to encounter him in his merciful love through the sacrament of confession.”

Washington, D.C. Newsroom, Dec 18, 2025 / 17:48 pm (CNA).

Encouraging participation in Mass and making the sacraments more accessible can deepen fulfillment among Catholics and therefore help to keep Catholics in the faith, experts say.

A recent Pew Research Center report, “Why Do Some Americans Leave Their Religion While Others Stay?”, examined the religious switching of U.S. adults. It looked into the reasons why people stay or leave their childhood faith.

The report revealed many U.S. adults (35%) have left the religion they grew up in, but the majority of Americans (56%) still identify with their childhood religion. The survey reported that Catholics specifically continue to identify with the faith because “their religion fulfills their spiritual needs” (54%) and “they believe in the religion’s teachings” (53%).

To better understand why Catholicism fulfills spiritual needs and which teachings are most important in that process, “it’s crucial that we pay attention to what’s working,” Tom Nash, a contributing apologist for Catholic Answers, told CNA.

He highlighted a June Pew study that found practicing Catholics believe “having a personal relationship with Jesus Christ” (90%) and “receiving the Eucharist” (83%) are the most essential aspects of their faith.

The study “tracks with the Church’s teaching that the sacrifice of the Mass is ‘the source and summit of the Christian life’ (Catechism of the Catholic Church, 1324), and provides insight regarding how the Church best fulfills someone’s spiritual needs and, relatedly, which teachings are most important,” Nash said.

“Through his one paschal sacrifice of Calvary — which encompasses his passion, death, resurrection, and ascension into heaven — Jesus has redeemed the world. In addition, Jesus enables us to offer anew sacramentally and partake of his one sacrifice in the Mass, which is the New Covenant Passover Communion sacrifice,” Nash said.

Receiving the sacraments

Since the majority of Catholics say the faith fulfills their spiritual needs and they believe in the religion’s teachings, it’s “best” to highlight what meets those aspects, Nash said. Specifically, he suggested making the sacraments accessible to Catholics.

“When we make sacramental encounters more available with Our Lord Jesus Christ, an increase in Sunday Mass participation will follow accordingly,” Nash said. 

Not only is receiving the Eucharist at Mass “fundamental,” but so is “communing with our Eucharist Lord Jesus spiritually through Eucharistic adoration,” Nash said. This allows Catholics to have “a deep relationship with Our Lord; and they thus form the bedrock of Catholic belief, because they enable us to have increasing divine intimacy with Jesus, and through him with the Father and the Holy Spirit.”

“For practicing Catholics, those who are not participating in weekly Mass, and people in general to whom Christ’s Great Commission is also addressed, we need to ‘Open the doors wide to Christ. To his saving power,’” as St. John Paul II said in his inauguration Mass.

The best and most convenient way to “open the doors” is “to give Catholics and non-Catholics alike the opportunity to draw near to our Eucharistic Lord Jesus in Eucharistic adoration,” Nash said. “With the help of parish deacons and laymen, every parish in the country can open its doors for adoration several nights a week for two to three hours.”

This will allow people to “draw near to the Lord in intimate spiritual communion, whether with our Eucharistic Lord exposed in a monstrance or reposed in the tabernacle. And also open the doors on a morning or two to accommodate those who work evenings.”

“A lot of people — inactive Catholics and non-Catholics alike — are not likely to come to Mass. But if you give them an opportunity to quietly spend time with Jesus in the Blessed Sacrament when it’s more convenient for them, they will draw near,” he said.  

The sacrament of confession is also necessary. Nash suggests making confession “available five to 10 hours every week at every parish.”

“It’s not by accident that two of the most demonically oppressed priests in the last two centuries are renowned priest confessors: St. John Vianney and St. Padre Pio,” Nash said. “The devil knows the power of this great sacrament and acts accordingly in opposing it. In this way, we can ironically take a lesson from Lucifer, who despite his being ‘the father of lies’ (Jn 8:44) can’t help but tell the true in expressing his unvarnished hatred of Our Lord Jesus Christ and his Catholic Church.”

Catholics must be ‘equipped’ and ‘formed’

Among all former Catholics whom the new study looked at, it found “the most commonly cited reasons for leaving include no longer believing in the religion’s teachings, scandals involving clergy or religious leaders, or being unhappy about the religion’s teachings about social and political issues,” said Becka Alper, senior researcher at Pew Research Center, in a Dec. 17 interview with “EWTN News Nightly.”

The study reported most former Catholics are now Protestants. They reported they switched because they stopped believing in the Church’s teachings (46%), “assuming they understand them well to begin with, and because they now believe in the distinctive teachings of Protestantism of one type or another,” Nash said.  

If Catholics are equipped “to explain the faith well in a joyful manner, we can stanch the hemorrhaging from the Church,” Nash said. This will also help “remove stumbling blocks for former Catholics and never-Catholic Christians regarding the nature of the Mass, Christ’s real presence in the Eucharist, and that he also provides us to encounter him in his merciful love through the sacrament of confession.”