From the Youtube post:
LibriVox recording of The Glories of Mary by Saint Alphonsus Liguori.
Read in English by Ann Boulais
The Glories of Mary is a classic book in the field of Roman Catholic Mariology, written during the 18th century by Saint Alphonsus Liguori, a
Doctor of the Church. The book was written at a time when some Jansenists (which were declared heretical by the Pope) were criticizing Marian
devotions, and was written in part as a defense of Marian devotion. The book combines numerous citations in favor of devotion to the Blessed
Virgin Mary from the Church Fathers and the Doctors of the Church with Saint Alphonsus’ own personal views on Marian veneration and includes
a number of Marian prayers and practices. – Summary by Wikipedia