ROME — Pope Leo XIV opened a four-day visit to France on Friday with a warning that a "paradise of machines," created by artificial intelligence and other technologies, could quietly undo the very humanity it was designed to serve. Speaking at the Élysée Palace, the pontiff framed his first official state visit to France in nearly two decades around a set of existential questions: what it means to be human in an age of machines, nuclear weapons and war.
The pope's remarks came in two settings on the opening day of the trip. He first addressed President Emmanuel Macron and French authorities at the Élysée Palace, then moved to the headquarters of UNESCO, the United Nations' culture and education organization, where he spoke to diplomats and U.N. employees. In both appearances he returned to the same theme — that scientific and technical progress, impressive as it is, is not automatically a good for humanity. Progress, he suggested, must be measured against the dignity of human life and the rights of the people it claims to improve.
It was an unusually futuristic vocabulary for a papal address, and it landed in a country whose political debate is dominated by strict secularism. France's approach to laïcité, written into the Constitution and enforced with unusual rigor, has steadily eroded the Catholic Church's influence on public ethical debates. The visit therefore carried a symbolic weight far beyond a normal foreign trip: the first official state visit by a pope to France in 18 years, and the first by an American pope, arriving at a moment when many observers had assumed the Church's voice in French public life had become largely ceremonial.
On nuclear weapons, the pope was notably sharper. With conflicts raging in Europe and the Middle East, he reaffirmed the Vatican's long-standing opposition to nuclear arms and dismissed the doctrine of nuclear deterrence as mistaken, arguing that the promise of mutually assured destruction does not prevent war so much as supply fresh fuel for a new arms race. "Peace is not a balance of power," he said, "rather, it is built day by day through dialogue and justice."
That position puts him at odds with a core plank of European security policy, and with the sustained modernization programs under way in several nuclear powers. The argument Leo advanced — that deterrence theory rests on circular logic, since the weapons meant to prevent attack are themselves a primary source of international tension — is one that disarmament advocates have made for decades, but one that few heads of state have been willing to voice in public while tensions remain high. Coming from a head of state whose moral authority rests on the premise of peace, the words are likely to be quoted in capitals across Europe in the coming days.
Despite the weight of the speech, the mood along the streets of Paris was anything but grim. Thousands of people lined the motorcade route, waving French and Vatican flags, some standing for hours in unseasonable heat for the chance to catch a glimpse of the passing popemobile. The scale of the turnout underlined just how unusual the visit is — not only as the first state visit by a pope to France since Benedict XVI in 2008, but as evidence of a public appetite for papal visits that outlasts the Church's institutional influence.
The contrast between that enthusiasm and the chillier political arithmetic in Paris was on display Friday evening, when thousands attended an evening prayer service at Notre Dame Cathedral, accompanied by angelic choirs and the cathedral's famously resonant organ. Among those present was Sister Antonia Faye of Senegal, who said afterward that attending an event with a pope for the first time was a profoundly moving experience. Being among other worshippers, she said, rather than praying alone, brought comfort and a sense of being blessed — a remark that captures the role the visit appears to be playing for ordinary Catholics in a highly secular society.
For Macron, the visit is also a personal capstone. The 49-year-old president is constitutionally barred from seeking a third term in elections expected in May, and hosting a pope is a high-profile way to mark the end of his tenure. The occasion carries a degree of diplomatic symbolism that has been building for years: Pope Francis repeatedly declined to make a proper state visit to France during his 12-year pontificate, and pointedly did not join the Macron inauguration. That history made Friday's meeting at the Élysée a notably different kind of arrival.
Leo's focus on artificial intelligence is not a one-off flourish. During the first months of his pontificate he made the technology a recurring subject of papal concern, moving the Vatican toward a formal study of the ethical, social and economic consequences of intelligent systems, and warning repeatedly about the risks of treating human judgment as something a machine could replace more efficiently. The France speech escalates that argument from a technical question to a civilizational one: the danger, Leo suggests, is not that machines will turn against people, but that people will be soothed into surrendering their agency, relationships and moral responsibility to systems that promise ease.
That framing is likely to resonate well beyond Catholic circles. France is already among the countries most advanced in deploying artificial intelligence in public services, and Brussels is deep in a debate over AI regulation that pits innovation against safety. A papal address arriving at the center of that argument — delivered, not coincidentally, to a diplomatic audience at UNESCO — gives the question of human dignity in an automated world a moral register that technical debate often lacks.
What remains to be seen is whether the pope's urgency survives contact with the rest of the itinerary. The remaining days are expected to bring further meetings with French leaders, appearances at national institutions and ceremonies, and more direct appeals on peace and disarmament. What is already clear after the first day is that Leo intends this trip to be less a diplomatic formality than an argument — about machines, about nukes, and about whether humanity is still capable of recognizing what it stands to lose.
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