The Church Speaks to the Modern World is the best collection of Pope Leo XIII’s social teachings. Etienne Gilson’s short introductions to each document help the reader to grasp the sapiential order and cohesion of Pope Leo’s teaching, without getting in the way of the documents themselves.
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Contents of the Leonine Corpus
Table of Contents
The Church Speaks to the Modern WorldThe Social Teachings of Leo XIII · Edited, annotated, and introduced by Étienne Gilson
The principal social encyclicals of Leo XIII, arranged as a coherent doctrinal body, together with Gilson’s introduction, summaries, notes, appendix, bibliographical material, and indexes.
Opening MatterForeword xiIntroduction xviiThe Principal EncyclicalsThe Leonine Corpus
IOn the Restoration of Christian Philosophy in SchoolsAeterni PatrisOn Christian Philosophy · August 4, 18793IIHuman LibertyLibertas PraestantissimumOn Human Liberty · June 20, 188831IIIOn Christian MarriageArcanum Divinae SapientiaeOn Christian Marriage · February 10, 188063IVFreemasonry and NaturalismHumanum GenusOn Freemasonry · April 20, 188493VOn Civil GovernmentDiuturnumOn the Origin of Civil Power · June 29, 1881121VIThe Christian Constitution of StatesImmortale DeiOn the Christian Constitution of States · November 1, 1885139VIIOn SocialismQuod Apostolici MunerisOn Socialism · December 28, 1878173VIIIRights and Duties of Capital and LaborRerum NovarumOn Capital and Labor · May 15, 1891187IXOn Christian CitizenshipSapientiae ChristianaeOn Christians as Citizens · January 10, 1890235Supplementary TextsAppendix
Appendix IOn the Evils Affecting Modern SocietyInscrutabili Dei ConsilioOn the Evils of Society · April 21, 1878269Appendix IIOn SlaveryIn PlurimisOn the Abolition of Slavery · May 5, 1888283Appendix IIIChristian DemocracyGraves de Communi ReOn Christian Democracy · January 18, 1901307Back MatterConclusion 327Bibliographical Note 331Index 335Index of Proper Names 341✠ ❦ ✠A coherent doctrinal body
From Christian philosophy to liberty, marriage, civil government, labor, citizenship, and the errors of modern society, the contents reveal the architecture of Leo XIII’s social teaching.
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Praise for the Leonine Corpus
Endorsements for
The Church Speaks to the Modern WorldThe Social Teachings of Leo XIIIEdited, annotated, and introduced by Étienne Gilson · Foreword by Thomas Storck
Scholars of theology, philosophy, history, and Catholic social teaching commend this volume as a necessary recovery of Leo XIII’s full social doctrine for the present age.
✠ ❦ ✠EndorsementsI“Pater Edmund Waldstein, O.Cist.Lecturer in Moral Theology, Heiligenkreuz, AustriaII““The greatest pope since the Reformation” is a towering figure, basking in the light of all that came before him and casting his protective shadow over everyone who recognizes his greatness. Here, bound in a single volume, are the principal acts of his pontificate introduced and explained by one of the greatest figures of the revival Leo accomplished. Every citizen, every statesman, every parent, every student should read and ponder this book a hundred times.
Alan Fimister, Ph.D.Assistant Professor of Theology at Saint John Vianney Theological Seminary, Denver, Colorado; Director of the Dialogos Institute; co-author of Integralism: A Manual of Political TheologyIII“Gilson’s edition, coming just before the Second Vatican Council, presents this teaching in its entirety, something that has been less usual in the post-conciliar period. This republication will contribute greatly to the recovery of the fullness of Catholic teaching on political, social and economic questions.
Dr. Thomas PinkProfessor of Philosophy, King’s College LondonIV“Now more than ever we need the sobriety and crystal clarity concerning political, cultural, and economic matters that characterize Pope Leo XIII’s social encyclicals, many of which are unjustly neglected today. This welcome reissue will help to remedy that, and thereby contribute to the good of the Church and of society.
Dr. Edward FeserProfessor of Philosophy, Pasadena City CollegeV“Founded on the unchanging principles of the social nature of man and its restoration in Christ, the encyclicals in this volume (with its helpful introduction, notes, and reading guides) speak to every age. For, to paraphrase one very old author, in human affairs, there is finally nothing really new under the sun.
Christopher ZehnderGeneral Editor, Catholic Textbook ProjectVI“The writings of Pope Leo XIII mark a decisive turning point in the history of the Church’s effort to engage modernity. The encyclicals collected in this volume are essential reading for those Catholics who wish to continue this engagement in our own time. These writings make clear that Leo refused to settle for a simple modus vivendi with secular modernity; rather, he saw engagement as but a modern instance of the Church’s perennial mission to bring Christ to the world and the world to Christ.
Christopher ShannonAssociate Professor of History, Christendom CollegeWhat the Praise EmphasizesA common judgment
IThe Fullness of Leo
The endorsers stress the importance of recovering Leo XIII’s social teaching in its breadth, order, and doctrinal cohesion.
IIGilson’s Clarity
Gilson’s introductions, notes, summaries, and reading guides illuminate the architecture of the papal teaching without obscuring the documents themselves.
IIIModern Engagement
Leo’s encounter with modernity is understood not as capitulation, but as an expression of the Church’s perennial mission to bring all things under Christ.
IVTeaching for Every Age
Political authority, labor, property, culture, family, and social order remain permanent questions, giving the Leonine corpus continuing importance.
✠ ❦ ✠A necessary recovery
The praise is united by one conviction: Leo XIII’s social encyclicals remain indispensable for Catholics seeking clarity about political, cultural, economic, and social life under Christ.
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The Church Speaks
to the Modern World
A definitive collection of the principal social encyclicals of Pope Leo XIII, arranged according to the order expressly indicated by Leo himself, and presented by one of the twentieth century’s great Catholic philosophers.
Catholics should not hope to restore any Christian political and social order on any other foundation than the philosophy of St. Thomas.Étienne Gilson, Introduction

Étienne Gilson
Gilson presents Leo XIII’s encyclicals as a living doctrinal body: ordered, Thomistic, political, social, and missionary. His introductions and summaries help the reader see the deep unity of Leo’s teaching without distracting from the papal texts themselves.
In the present pontificate of Leo XIV, this volume takes on fresh urgency: the name Leo naturally recalls the pope who gave the modern Church one of her clearest and most comprehensive responses to liberalism, socialism, naturalism, false liberty, and the social question.
The Leonine vision in a single volume
This is a new edition of Étienne Gilson's compendium of Pope Leo XIII's social encyclicals as arranged by the Pope himself. Originally published in 1954, this new edition features a foreword by Thomas Storck. It is newly typeset and presented in a larger 6 × 9 trim size for easier readability. All the original endnotes have been converted into footnotes.
In The Church Speaks to the Modern World, Gilson presented the basic encyclicals of Leo XIII arranged in the order expressly indicated by the Pope himself. Gilson’s introduction provides the proper perspective for the encyclicals; his notes clarify obscure points; his summaries provide an immediate grasp of each encyclical; and his study of the variant translations is an invaluable scholarly aid.
Here, in a single volume, is a collection of some of the most important and far-reaching papal pronouncements of the modern age.
Why Leo XIII still matters
The modern world continues to wrestle with the questions Leo XIII addressed: liberty, authority, marriage, labor, private property, socialism, naturalism, Freemasonry, the duties of citizens, and the Christian constitution of civil society.
Thomistic Foundations
Leo begins social restoration with Christian philosophy and the doctrine of St. Thomas Aquinas.
True Liberty
Against license and indifferentism, liberty is understood as ordered to truth, law, and the good.
The Social Question
Leo treats capital, labor, property, the family, Christian citizenship, political authority, and the common good.
Christ and Modernity
The Church engages the modern world not by capitulation, but by bringing Christ to the world and the world to Christ.
The principal texts
Gilson’s edition gathers the central texts of the Leonine social corpus, together with introductions and summaries that make its doctrinal architecture visible.
Beyond the principal encyclicals
Inscrutabili Dei Consilio
On the evils affecting modern society.
In Plurimis
On slavery and its abolition.
Graves de Communi Re
On Christian democracy.
Gilson's Editorial Apparatus
Introduction, summaries, annotations, bibliographical note, and indexes.
Reading Leo XIII today
What does Pope Leo XIII teach about liberty when liberty is no longer ordered to truth?
Why did Leo regard the restoration of Christian philosophy as essential for social order?
How do the rights and duties of capital and labor depend upon a correct doctrine of man?
What does it mean for the Church to speak to the modern world without becoming modernist?
Book Details
A coherent doctrinal body
From Christian philosophy to liberty, marriage, civil government, labor, citizenship, and the errors of modern society, the volume reveals the architecture of Leo XIII’s social teaching.