Lettre encyclique MAGNIFICA HUMANITAS du Saint-Père LÉON XIV sur la protection de la personne humaine à l'ère de l'intelligence artificielle
First social encyclical of **Pope Léon XIV** (Robert Francis Prevost), dated **15 May 2026** (Rome, near St. Peter's, 2nd year of the Pontificate), published for the **135th anniversary of *Rerum Novarum*** (Léon XIII, 15 May 1891) and explicitly presented as a **continuation of the Church's Social Doctrine into the AI era**. Canonical subtitle: *"on the protection of the human person in the age of artificial intelligence"*. **245 paragraphs**, structured as **Introduction + 5 chapters + Conclusion**. **Pivotal thesis** organized around two **biblical icons**: the **Tower of Babel** (Gen 11) — technological uniformity without God, *"absolutization of the human"* — versus **Nehemiah's reconstruction of the walls of Jerusalem** (Neh 2-6) — shared responsibility stone by stone, listening, coordination among families. *"The first choice is not between a 'yes' or a 'no' to technology, but between building Babel or rebuilding Jerusalem"* (n. 9). **Canonical concepts**: (1) **AI "cultivated" rather than "constructed"** — *"developers do not directly design every detail, but create an architecture on which the AI develops"* (n. 98), a remarkable theological formulation that echoes recent ML-research vocabulary; (2) ***"Disarming AI"*** (n. 110) — *"removing it from the logic of armed competition, which today is no longer only military but also economic and cognitive"*, making AI *"habitable, by restoring it to the plurality of human cultures"*; (3) **Radical critique of "alignment"** — *"We cannot content ourselves with invoking the moralization of the machine, what is called the 'alignment' of AI with human values, without having the courage to add a further condition: the possibility of debating the ethical code to be used"* (n. 107). ***"A more moral AI is useless if that morality is decided by a handful of people."*** (4) **Epistemic asymmetry** and **new AI monopolies** (n. 109) — *"in a world where a few actors concentrate data, computing resources and regulatory power"*; (5) **Invisible labor** of data labelers/moderators/rare-earth extractors (n. 109, 173) — *"bodies marked, mutilated, used so that the flow of computation never stops"*; (6) **Data colonialism** (n. 178) — *"it dominates not only bodies, but appropriates data"*, *"new rare earths of power"*; (7) **AI and war** (n. 197-200) — *"No algorithm capable of making war morally acceptable"* (n. 198), three criteria: traceable personal responsibility, refusal to shorten the time for moral judgment, protection of civilians; (8) **Critique of transhumanism/posthumanism** (n. 115-117) as *"an archipelago of conceptual islands linked by the same ocean of assumptions: the centrality of technique and the dream of surpassing the limits of the human condition"*; (9) **Work in the transition** (n. 150-156) — *"contrary to the advertised benefits of AI, current approaches to technology can paradoxically deskill workers, subject them to automated surveillance"*, access to work as a public priority, anticipation of the transformation, setting social criteria for innovation; (10) **Canonical question drawn from John Paul II** (Redemptor hominis 1979): ***"does AI make human life on earth 'more human' in every respect? Does it make it more 'worthy of man'?"*** (n. 129); (11) **Authentic "more than human"**: not transhumanism, but grace — *"we manage to be fully human when we are more than human, when we allow God to lead us beyond ourselves"* (n. 128, citing Francis, *Evangelii gaudium*); (12) **Disarming words** (n. 214) — *"Let us disarm words and we will help disarm the Earth"*. **Addressees**: *"To all Catholic faithful, to all Christians, to all men and women of good will"* (n. 16) — a **universal** register in line with *Pacem in terris* (John XXIII 1963), *Laudato si'* (Francis 2015) and *Fratelli tutti* (Francis 2020). **Special appeal to AI developers** (n. 111): *"every design choice expresses a vision of humanity"*. Key **magisterial source** cited: *Antiqua et nova* (Dicasteries for the Doctrine of the Faith + Culture and Education, 14 January 2025) + *Quo vadis, humanitas ?* (International Theological Commission, 9 February 2026). A major document of the **2026 social Magisterium**, at the junction of Social Doctrine ↔ AI ethics ↔ big-tech geopolitics ↔ critique of microworker labor/rare-earth extraction. Implicit convergence with **Mensch / Mistral** (AI energy sovereignty), **Sun / NYT Permanent Underclass** (cf. labor→capital shift), **Wallace-Wells / NYT AI Populism** (cf. critique of tech oligarchs), **Mollick × roon** (cf. ASI and internal politics). First encyclical by a Pope to explicitly take AI as a **central, structuring subject** rather than one theme among others.
**Léon XIV** (de naissance Robert Francis Prevost) · 267e Pape de l'Église catholique · élu le **8 mai 2025** · premier pape américain de l'histoire (né à Chicago, USA, 1955 ; double nationalité américano-péruvienne). Augustinien (ancien Prieur général de l'Ordre de Saint-Augustin 2001-2013) · ancien évêque de Chiclayo (Pérou) puis Préfet du Dicastère pour les Évêques (2023-2025). *Magnifica Humanitas* est sa **première encyclique sociale** · signée *« Donné à Rome · près de Saint-Pierre · le 15 mai de l'année 2026 · la deuxième de mon Pontificat »* — date choisie pour **coïncider avec le 135e anniversaire de *Rerum Novarum*** (15 mai 1891) de Léon XIII · dont il a explicitement repris le nom de pontificat en référence à la tradition sociale lancée par son prédécesseur du XIXe siècle. La référence augustinienne est centrale dans le document (citations massives des *Confessions*, du *De civitate Dei* — *« deux amours ont fait deux cités »*, des *Enarrationes in Psalmos*, des *Sermones*). Trace de paternité collective : multiples références à *Antiqua et nova* (note conjointe DDF + DCE, 14 janvier 2025) et *Quo vadis · humanitas ?* (CTI, 9 février 2026) · suggérant un travail conjoint entre la Secrétairerie d'État · le Dicastère pour la Doctrine de la Foi · le Dicastère pour la Culture et l'Éducation · et le Dicastère pour le Service du Développement humain intégral.