In 2017 I published Not by Scripture Alone: A Latter-day Saint Refutation of Sola Scriptura, a book-length critique of the formal doctrine of Protestantism, Sola Scriptura (Latin: "Scripture i.e., the Bible] Alone"). This is the follow up to that volume, a full-length discussion of the biblical and historical evidence for Latter-day Saint theology of the priesthoods (Aaronic and Melchizedek) as restored through the Prophet Joseph Smith (1805-1844), and provide a defence of Latter-day Saint claims to authority.