Pastoral Care, or The Book of the Pastoral Rule, is a treatise on the responsibilities of the clergy written by Pope Gregory I in which he contrasted the role of bishops as pastors of their flock with their position as nobles of the church: the definitive statement of the nature of the episcopal office. Gregory enjoined parish priests to possess strict personal, intellectual and moral standards which were considered, in certain quarters, to be unrealistic and beyond ordinary capacities. The influence of the book, however, was vast and became one of the most influential works on the topic ever written. It was translated and distributed to every bishop within the Byzantine Empire.