This collection of correspondences between Calvin and Sadoleto is an excellent primary source view of the most controversial issues facing Christians at the time. The split between Reformation and Roman Catholic beliefs was growing ever larger and the consequences more severe. While Calvin writes with deep theological arguments and in defense of individuals searching for truth, Sadoleto’s pleas sound more like an emotional cry for unity, peace-keeping, and the return of the Catholic Church’s lost children. This exchange and the ideas laid out in Calvin’s letters are not only pertinent to the understanding of the history of the Christian church, but are also indefinitely relevant to individuals of any time period or circumstance looking to defend their faith and those in pursuit of truth.