It is intended to instruct the faithful, and satisfy their pious desires. There might, perhaps, have been some reason to fear, at the very outset, that the mere title of Devotion to the Sacred Heart of Jesus Christ, however it might attract many persons to read this book, might also deter many others. Arrested by the first words, they might be led to form an inaccurate idea of the devotion. To remove this difficulty, it has been thought well to explain in the beginning, what is understood by devotion to the Sacred Heart of Jesus Christ. Experience has proved, that there is no one, who, after seeing in what it consists, does not agree, that it is reasonable, solid, and most useful, for our salvation, as well as for our perfection