Jon Del Arroz’s new book, The Wages of Sin, releases August 20, following up Churchianity, which hit number 1 in Amazon’s religious philosophy category last year. Where Churchianity diagnosed the consumer-driven model reshaping American parishes, the new book turns to a word Del Arroz says most pulpits quietly retired: sin.

The Wages of Sin builds its structure on the Confiteor, the confession prayer Catholics have recited at every Mass since at least the tenth century. Del Arroz splits the book into four sections, one for each phrase of the prayer: thoughts, words, deeds, and omissions. Nine chapters work through the sins Augustine confessed in his Confessions, including pride dressed as worship, envy refined into schadenfreude, the spiritual torpor the Church Fathers called acedia, and the four sins Scripture names as crying out to heaven for vengeance. Each chapter closes with an examination of conscience, and the appendix adds a full one plus a vice-virtue table for daily use.

The book leans on Augustine’s framework of sin as disordered love: not a checklist of prohibitions, but the habit of loving the wrong things, or loving right things out of order. Del Arroz traces that idea into Romans 6:23 and the Catechism’s teaching on mortal sin, arguing that a Church which stopped naming sin also stopped being able to prescribe its cure.

Maneuver warfare, often controversial and requiring operational and tactical innovation, poses perhaps the most important doctrinal questions currently facing the conventional military forces of the U.S. Its purpose is to defeat the enemy by disrupting the opponent’s ability to react, rather than by physical destruction of forces. This book develops and explains the theory of maneuver warfare and offers specific tactical, operational, and organizational recommendations for improving ground combat forces. The authors translate concepts—too often vaguely stated by maneuver warfare advocates—into concrete doctrine. Although the book uses the Marine Corps as a model, the concepts, tactics, and doctrine discussed apply to any ground combat force.