Arguably the most significant spiritual and biblical theology ever penned from the English Puritan era, the presentation of William Gurnall's (1616-1679) The Christian in Complete Armour in an accessible single volume is certainly a landmark, and much welcomed, event. According to the Apostle Paul, the world is at war. Not a "hot war" but a war in the realm of the spirit. This war, paul warns, requires special armament, and he explains that armament in Ephesians 6. Anglican cleric Gurnall began to explore Paul's exhortation in sermons and lectures, which he published under the title The Christian in Complete Armor. A perennial best-seller in Gurnall's own lifetime, these teachings became his legacy, influencing well over three centuries of Christians and eliciting praise from the likes of Richard Baxter, John Flaven, John Newton, Charles Spurgeon, Jonathan Edwards. Historical theologians and Church Historians should benefit greatly from this volume, as should anyone who stands in the Reformed tradition. It sheds much light on the pre-critical puritan view of the world, as well as illuminating a subject matter both theologically and spiritually that us moderns either ignore or take for granted.