The Book of Pastoral Rule (Liber Regulae Pastoralis, c. 590 AD) is Pope Gregory the Great's comprehensive guide to pastoral ministry, addressing the character, conduct, and teaching responsibilities of those charged with spiritual oversight of souls. We have updated this timeless classic into a modern, updated translation that is easy for anyone to read! Written shortly after Gregory's reluctant elevation to the papacy, this work combines deep spiritual wisdom with practical guidance, establishing standards for pastoral ministry that profoundly influenced medieval and Reformation understandings of ministerial office and duties. Gregory systematically addresses pastoral ministry across four major sections: who should undertake pastoral office and the gravity of this responsibility, how pastors should live to maintain credibility and spiritual authority, how pastors should teach adapting instruction to hearers' varied conditions and needs, and how pastors should maintain humility recognizing their own weaknesses while guiding others. His treatment demonstrates remarkable psychological insight into both pastoral challenges and varied spiritual conditions requiring differentiated approaches. What distinguishes this work is Gregory's exceptional balance between high standards for pastoral office and realistic acknowledgment of ministers' human limitations, avoiding both lax permissiveness lowering ministerial expectations and harsh perfectionism crushing under impossible demands. Unlike works presenting purely idealistic visions or cynical pragmatism, Gregory combines serious view of pastoral responsibility with compassionate understanding of ministerial struggle. His treatment is especially valuable for demonstrating how spiritual authority requires corresponding personal holiness while ministers themselves remain imperfect saints needing divine grace. The work addresses pastoral qualifications, emphasizing that pastoral office should be neither rashly assumed by the unqualified nor avoided by those called, with proper humility recognizing unworthiness coexisting with obedient acceptance when duty requires. Gregory shows how pastoral ministry demands exceptional character including purity of intention, exemplary conduct, wisdom in judgment, and devotion in prayer, with personal godliness essential for effective ministry since ministers teach as much through example as precept. Gregory particularly excels in his lengthy treatment of differentiated pastoral instruction, providing detailed guidance for adapting teaching to thirty-six different pairs of contrasting conditions including rich and poor, joyful and sad, wise and dull, impudent and bashful, healthy and sick, married and single. He demonstrates how effective pastoral care requires understanding individual circumstances, temperaments, and spiritual needs rather than applying uniform approaches, with wise pastors varying counsel according to hearers' conditions while maintaining consistent biblical truth. Author Biography Gregory I (c. 540-604 AD), known as Gregory the Great, was one of the most influential popes in Christian history, whose administrative reforms, theological writings, and pastoral leadership profoundly shaped medieval Christianity. Born to Roman aristocratic family, Gregory initially pursued civil service before converting family estates into monasteries and embracing monastic life. Elected pope reluctantly in 590 AD, he demonstrated exceptional administrative ability reorganizing church lands, defending Rome against Lombard invasions, and extending papal authority while maintaining humble pastoral spirit.