This book has the modest aim of explaining why Modernism is the most dangerous of all heresies, and the steps taken by St. Pius X to suppress it. The author rarely refers to the contemporary Church, and yet on page after page the reader will cry out: "But this is just what is happening today!" Those who read this book will know all they need to know about Modernism, and will certainly understand why they have a duty to help defend the Faith against...