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A definitive and accessible guide to Pope St. Pius X’s landmark encyclical, designed to unmask and refute the intellectual errors of the modern era.

When Pope St. Pius X issued Pascendi Dominici Gregis in 1907, he identified Modernism as nothing less than the “synthesis of all heresies.” Recognizing the immense complexity and philosophical density of the papal document, Father Jean Baptiste Lemius undertook the vital task of translating the pontiff’s profound insights into a clear, systematic question-and-answer format, earning the official praise and endorsement of the Holy See itself.

Through its disciplined catechetical structure, the work methodically dissects the multi-faceted nature of the Modernist system. Father Lemius traces its underlying philosophical assumptions—from agnosticism and vital immanence to radical historical criticism—exposing how these doctrines subtly redefine revelation, dogma, the sacraments, and the divine authority of the Church.

By isolating each premise with precision, the text transforms a formidable theological treatise into an indispensable manual of defense. It demonstrates with clarity why the internal crisis of the early twentieth century posed an unprecedented threat to traditional Catholic orthodoxy, seeking not merely to alter individual beliefs, but to change the very concept of religious truth.

A Catechism on Modernism remains a primary historical witness and a vital resource for understanding the theological controversies that continue to shape the contemporary Church. It offers students of history, clergy, and lay readers alike a lucid and enduring roadmap for defending the integrity of Christian doctrine.