Pope Leo XIV arrived in France on Friday with a warning aimed at the age of artificial intelligence, opening a four-day official state visit with a speech that placed the Catholic Church squarely in the middle of Europe's debates about technology, war and the future of human dignity.
Speaking first to President Emmanuel Macron and French authorities at the Élysée Palace, and later to diplomats and United Nations employees at the headquarters of UNESCO, the U.N. culture and education organization, Leo framed his visit as a question rather than a sermon: what, precisely, does it mean to be human when machines can do what human hands once did, and when the threat of nuclear annihilation has returned to the daily news?
The pope warned that a "paradise of machines" risks undermining humanity itself. His remarks were notable for their framing. Rather than treating artificial intelligence as a tool to be managed, Leo cast it as a civilizational question, one that sits alongside the nuclear arms race and other threats to life itself. In doing so, he placed the papacy in the same conversation as scientists, ethicists and policymakers who have been grappling with the pace of machine development and the gap between technical capability and moral restraint.
The speech landed against a backdrop of war. With conflicts continuing to plague Europe and the Middle East, Leo used his platform to reaffirm the Vatican's long-standing opposition to nuclear weapons. He went further, describing the doctrine of nuclear deterrence as "mistaken," arguing that the idea of holding the threat of annihilation in reserve does not prevent war but simply fuels a new and more dangerous arms race.
"Peace is not a balance of power; rather, it is built day by day through dialogue and justice," he said, a formulation that echoed generations of Catholic social teaching on just war and peaceful coexistence while also offering a pointed rejoinder to realpolitik.
The visit carries unusual significance for both sides. It is the first official state visit by a pope to France in 18 years, and it comes at a moment when the Catholic Church has lost substantial ground in shaping ethical debate in a country whose strict approach to secularism — laïcité — is enshrined in the French Constitution. In France, the pope arrives less as a political actor than as a moral voice operating outside formal authority, which makes the scale of the welcome outside the Élysée Palace all the more striking.
Thousands of people lined the motorcade route through the country, waving French and Holy See flags. Some waited for hours in unseasonable heat for a glimpse of the pontiff. The turnout underscored a level of interest that observers of the trip described as surprising, given the fading influence of the Church in French public life and the famously guarded posture of French institutions toward Rome.
The emotional center of the Friday leg of the visit came in the evening, at a prayer service at Notre Dame. The cathedral's booming organ and angelic choirs framed an event that drew worshippers from abroad. Sister Antonia Faye, a Senegalese nun, described her first encounter with a pope as a moment of spiritual reassurance.
"To see him, praying with us, it comforts us in our faith and on our path," she said, standing after the service. "Being with the pope is different to being alone or praying alone. We felt the benediction that came down on us."
For Macron, the visit functions as a capstone. The French president is barred from seeking a third term in the May elections, and hosting the leader of the Roman Catholic Church — the first American pope — presents him with a high-profile opportunity to project international stature at home. The setting, the Élysée Palace, is the French presidency's own stage, and the joint appearance with Leo underlined the ceremonial weight of the occasion.
The trip also marks a sharp break with the immediate predecessor. Pope Francis declined repeatedly to make a proper state visit to France during his 12-year pontificate, a reluctance that included pointedly declining to take part in an inaugural ceremony in France. Leo's decision to come changes the dynamic of the Franco-Vatican relationship almost overnight, and the contrast is likely to be a theme of the visit.
Analysts note that the sequencing of Leo's day carried its own message. Addressing the French head of state in the morning and then a multilateral audience at UNESCO in the afternoon allowed the pope to make two distinct arguments at once: to a national leader, that Europe's security architecture and its reliance on deterrence had become morally untenable; and to the international community, that the institutions of the United Nations are the proper forum for questions of human dignity that no single state can resolve.
That rhetorical strategy also neatly resolves a tension inherent in a papal visit to a highly secular country. Leo can speak to French society about ethics and human rights without appearing to encroach on the state's authority, because the argument is framed in universal rather than doctrinal terms.
The stakes of the message are not merely theoretical. Artificial intelligence regulation remains unsettled in Europe, the Vatican's own deliberations on the technology have drawn wide attention, and the nuclear question is no longer abstract in an era of renewed great-power competition. By naming all three in a single day of remarks, Leo has set a theme that will likely echo through the rest of his four-day schedule.
Whether that theme translates into policy is another matter. The pope's influence over governments is limited by design, and his audience in France — as the crowds and the prayer service made clear — is as much a constituency of the faithful as it is a public to be persuaded.
Still, the contrast between the pope's message and his welcome is itself striking. In a country where religion is officially separated from public life and where the Church's voice has receded from national debate, thousands turned out in the heat to see a pope who used his first hours abroad to warn against a future in which machines, and the weapons they make possible, may decide the fate of the human species.
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