What is a heresy? What were the great heresies of the past? This book is one of the best books published on this subject. Confusion and lack of a sense of proportion, characteristic of the modern mind, have made the question dark, even unintelligible; yet it remains essential for anyone who wishes not only to understand the deep workings of our history, but also to identify the sources of our present convulsions. Supported by the author's clear writing, colossal scholarship, and prophetic spirit, this essay condenses and presents the most formidable attempts to overturn the Catholic Church, from its origins to the present day:- The Arian heresy and its crystallization in the heart of the Roman Empire. - The Reformation and the modern implosion of Christianity - The contemporary enterprise of destruction, manifested at all levels of social life.

Hilaire Belloc (1870-1953) is a forgotten giant of English letters. A great friend of G.K. Chesterton, this historian, a key figure in 20th century Catholic thought, left a body of work of more than 150 books, as diverse as they are substantial.