First Encyclical Letter of Pope Leo XIV—“Magnifica Humanitas”—on Artificial Intelligence: A summary
Introduction: Two cities, one choice Leo XIV opens with two biblical images: the Tower of Babel and the rebuilding of Jerusalem under Nehemiah. One is a project of pride and uniformity; the other is slow, communal, and rooted in God. The whole encyclical flows from this choice. Are we building Babel—efficient, powerful, dehumanising—or Jerusalem, brick by patient brick?
Chapter 1: A living tradition
The Pope traces the Church’s social teaching from Leo XIII through Francis, showing how each pontiff responded to the crises of his time. The line runs from workers’ rights through nuclear war, environmental collapse, and global inequality.
Chapter 2: The principles that don’t change
Here the encyclical restates foundational pillars: human dignity, the common good, subsidiarity, solidarity, social justice, and integral human development. Solid, familiar ground — until it isn’t. Leo XIV explicitly includes algorithms, data, digital platforms, and patents under the principle of the universal destination of goods. Data is not a tech company’s property. It belongs, in a real sense, to everyone.
Chapter 3: What AI is, and what it isn’t
This is the doctrinal heart of the letter. AI, Leo XIV writes plainly, is not human intelligence. It processes data. It cannot feel, suffer, love, or bear moral responsibility. It can simulate empathy without understanding it. That matters enormously when we hand it power over people’s lives.
The Pope calls for AI to be “disarmed” — freed from the logic of geopolitical and commercial competition, from monopolistic control, and returned to the plurality of human cultures.
Chapter 4: Truth, work, and freedom
Chapter four is the most wide-ranging. It covers disinformation and democracy, the transformation of work by automation, the fragility of families under economic pressure, the dangers of digital addiction, and the exploitation of workers hidden inside AI supply chains.
Chapter 5: The Civilisation of Love
The final chapter turns to war. It is blunt: military spending is rising, ethical limits are eroding, and AI is making lethal decisions faster and more impersonally than ever.
Leo XIV states clearly that traditional just war theory is now outdated. In a world of autonomous weapons and hybrid warfare, the old framework cannot hold. Diplomacy, dialogue, and multilateralism are the only realistic path forward.
Conclusion: Nehemiah’s lesson
The encyclical closes with a practical programme: stay faithful to truth, invest in education, cultivate real relationships, love justice and peace. The image is Nehemiah, sleeves rolled up, rebuilding wall by wall. That, Leo XIV suggests, is what it looks like to be Catholic in the age of artificial intelligence.