Pope Leo XIV signed Magnifica Humanitas on 15 May 2026, the 135th anniversary of Leo XIII’s Rerum Novarum. He took the name Leo, he chose the date, and he built the argument on the older encyclical’s method. None of that is decoration. It tells you what kind of document you are reading and what it is claiming to do.
What Leo XIII proposed in 1891
Rerum Novarum looked at an economy that had reorganized itself faster than anyone had worked out how people should live inside it. Leo XIII put the dignity of work and of workers at the center, affirmed the right to a fair wage, recognized that persons “have a fundamental value that takes precedence over capital and profit,” defended private property along with its social role, and backed workers’ associations (§30). Pius XI later called it the “Magna Carta” of Christian social action (§30).
The more important thing he did was methodological. Faced with the upheaval of his day, he “did not limit himself merely to acknowledging the unrest, but saw these situations as an area for the Church’s pastoral mission,” exposing them “to rigorous discernment” in the light of the Gospel and an integral view of the human person (§29). Saint John Paul II called that approach a “lasting paradigm” of social doctrine (§29), and it is that paradigm, rather than the specific conclusions about factory wages, that Leo XIV picks up.
Leo XIV names the two insights from 1891 he considers still binding: “the primacy of human labor over any mindset focused solely on finance or productivity” with its consequent attention to families most exposed to exploitation, and “the inseparable link between proclaiming the Gospel and pursuing a more just social order” (§30).
The parallel, stated carefully
Leo XIII faced workers thrown into an industrial economy nobody had prepared them for. Leo XIV faces workers being drawn into an automated economy nobody has prepared them for. He opens the encyclical by saying that repetition would not be enough: “today we cannot limit ourselves simply to repeating his insightful teachings” (§4). The task is to apply the same method to different facts.
But he also identifies a difference that changes the problem. In 1891 the state was the body that could direct industry. Now, Leo writes, “the main drivers of development are private, often transnational, parties that are endowed with resources and the capacity to intervene that surpass those of many Governments,” producing a technological power that is “unprecedented, predominantly ‘private’” (§5).
That is a real break with 1891, and it is why the newer encyclical spends so much effort on accountability and oversight. Leo XIII could ask the state to restrain the mill owner. Leo XIV is describing actors whose reach exceeds the states that would regulate them.
The thread that runs through both: work
The continuity is clearest on work. Magnifica Humanitas takes John Paul II’s Laborem Exercens, itself written for the ninetieth anniversary of Rerum Novarum, and quotes its definition:
“Work is not considered simply as a problem to be dealt with or a means of generating income, but a fundamental good for the person, a principle of economic activity and the key to the entire societal question.” (§37)
Leo XIV then applies that standard to automation directly, saying that job insecurity, fragmented careers and automation “must not be evaluated solely in terms of efficiency, but in relation to the dignity of the worker, the right to sufficient remuneration and the genuine possibility of participating in society” (§37). And he restates the older claim in his own voice: since Rerum Novarum the Magisterium has recognized in work “the essential key” to the entire social question (§148).
Where he says the 1891 toolkit is no longer sufficient
This is the most interesting turn, and it is easy to miss. The institutions that grew out of Rerum Novarum, the associations, unions, cooperatives and welfare organizations, “have contributed decisively to improving labor legislation, protecting the most vulnerable and promoting more humane conditions” (§155). Then the qualification:
“Today, however, these instruments are no longer sufficient by themselves in the face of the transformations driven by AI, the new organization of markets and the competitiveness that is rarely concerned with social sustainability.” (§155)
He asks for new collaboration among political leaders, labour organizations, business and the scientific community, “including at the international level,” and calls unions, which the Church has consistently supported, to open themselves to new kinds of employment (§155). His warning if that does not happen is stark: many people left “marginalized, stranded and surrounded by the machines and automated systems that have replaced them” (§155).
What the anniversary is claiming
Choosing the date is an argument in itself. It says that artificial intelligence is not a special topic requiring a new framework, but the current form of the social question, and that the tradition beginning in 1891 is adequate to it. Leo XIV puts the claim in the first chapter: AI “should not be considered as merely yet another theme to be studied or a crisis to be managed, but rather as a development that challenges the categories of Social Doctrine from within, calling for their further development in fidelity to the Gospel” (§17).
Section references are to Leo XIV, Magnifica Humanitas (15 May 2026), which is also the source for the summaries of Rerum Novarum given there. The full guide is here.
Related
The Catholic Citizen starts with this encyclical
Module 1 of The Catholic Citizen works through Magnifica Humanitas over four Thursdays — human dignity, moral responsibility, work, and who owns the common inheritance of data — one issue a week, every claim cited by paragraph number. The curriculum page lists the module in full. Free reflections on the daily Mass readings arrive Saturdays.
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