This classic by St. Louis de Montfort is still considered to be the finest book ever written about the Rosary. With over 5 million copies sold, it is clear why this book has been read by Catholics all across the world for centuries. The Secret of the Rosary discusses why the Rosary is the most important prayer we can pray, and how to pray it well. It shows the great spiritual power of the Rosary, which is appreciated by few. Canon William says of De Montfort's book, “It goes far beyond mere research. We might say that it contains everything that can be said about the Rosary–its content and form, its real worth, about the instruction necessary for its appreciation and use.”