This book was composed by St. Alphonsus Liguori during a time of criticism of Marian devotions. St. Liguori brings his considerable knowledge of Scripture and the Church Fathers to bear on the issue, showing their devoted support of the Virgin Mary. St. Liguori also includes the Marian prayers and practices that he is familiar with.
This work is divided into two main sections:
An explanation of the Salve Regina (Hail Holy Queen), where he explains how God graced the world with Mary as a "Gate of Heaven", echoing St. Bonaventure's words, "No one can enter Heaven unless by Mary, as though through a door"
Discourses on various feasts that involve Mary, such as the Immaculate Conception and the Nativity