Before the Reformation of the sixteenth century, worship in the Roman Catholic Church had deteriorated into sacramentalism and superstition. How did John Calvin contribute to the great change in worship that came to the Protestant churches as a result of the Reformation? What principles did Calvin glean from Scripture that apply to how the church ought to worship God today? What did Calvin believe about preaching? How would Calvin evaluate what is going on in worship in modern Protestantism? These are some of the questions Professor Cammenga will answer in this speech.