Thirty years ago the great Pope Leo XIII consecrated the whole world to the Sacred Hearth of Jesus. After pronouncing the Act of Consecration he said: 'This is the greatest act of my pontificate.' Today the devotion to the Sacred Heart of Jesus is the most widely practiced and the most favorite devotion of the people. This volume, perhaps more than any other on the Sacred Heart of Jesus, will draw the souls closer to the side of Jesus and give them that fuller realization of the desires of our divine Savior, whish is one of the needs of our time.