This rich classic passed out of common usage years ago, but here we find it restored for the first time to the benefit of the English reader. St. Alphonsus transformed the landscape of the experience of this Reconciliation, and our confessional experience would be unthinkable without his saintly, intellectual, and pastoral prowess. While the cultural and historical context is amazingly fascinating, it necessitates peeling back those layers to see the glimmering treasure within. For that reason, this edition provides an introductory essay that steps lightly to take note of these difference for a fruitful reception of the saint's genius. May all readers benefit for the greater glory of God.