The treatise systematically analyzes Satan’s malice, power, knowledge, cruelty, diligence, and craft, arguing for the reality and scope of spiritual agency and detailing how temptations are devised and deployed. Organized in three parts with chapter-length treatments, it canvasses evidence from witchcraft, apparitions, and possessions, assesses what devils can know and accomplish, and sets out practical rules and pastoral counsels for discerning and resisting temptation. A sustained exposition of the Lord’s Temptation concludes the work, combining theological argument, scriptural interpretation, and consolatory guidance for readers facing spiritual trial.