This is a book written by a convert to Roman Catholicism primarily for other Catholics, but can be profitably read by other Christians, especially Eastern Orthodox and Anglicans/Episcopalians who have similar understanding of the priesthood. Bergsma discusses priesthood as it appears in the Old Testament in its various forms. Adam is described as God's first priest and how he failed at it in the Garden of Eden. Noah, Abraham, Isaac, Jacob and his 12 sons were also priests in some of their functions. In Exodus, the oldest sons of all the families of the tribes were priests but lost their priestliness when they sinned by worshipping the Golden Calf. Thereafter the priesthood was restricted to the tribe of Levi. But there was also a different line of priests which Kings David and Solomon had, as successors of Melchizedek, the King of Salem (i.e. Jerusalem) who blessed Abraham in Genesis. In the Letter of the Hebrews in the New Testament, Jesus is said to be a priest after the order of Melchizedek. In Chapter 3, Bergsma discusses the priestly functions of Jesus and his apostles, what their functions were and how it was passed on - the Church's "apostolic succession" of the episcopate. The last chapter discusses priestly celibacy, how it has Jesus and other New Testament warrant, and its Old Testament precedents. Also discussed is how the Essenes of the Qumran monastery who produced the Dead Sea Scrolls practiced celibacy. He notes that there are two types of priesthood in the church - what Protestants call the priesthood of all believers, and the ministerial priesthood of Bishops, Priests and Deacons who administer the sacraments. The calling of the former, the laity, is to live the Christian life in the secular world, at their jobs, etc. and share the gospel.