Developing the virtue of humility and faithfully endeavoring to practice it is necessary for our salvation. Many times in Sacred Scripture, Our Lord admonishes the proud, elevates the humble, and reminds us that we must become like children to enter into the kingdom of God. Pope Leo XIII, the oldest reigning pope, composed the prayer to St. Michael the Archangel and wrote many encyclicals on the Church's social teaching and the Rosary. His fidelity to the Church and her many faithful lead him to write this brief but poignant treatise. Within these pages, he delivers sixty lessons filled with practical advice for extinguishing pride and increasing humility. With Pope Leo XIII's wisdom, by God's grace, readers will be able to heed Christ's instruction: "Learn of Me, because I am meek and humble of heart" (Matt. 11:29).