is a multivolume study by Hughes Oliphant Old that explores the history of preaching from the words of Moses at Mount Sinai through modern times. In Volume 4, , Old focuses on changes in preaching due to the Protestant Reformation and the Catholic Counter-Reformation. This is the pivotal volume in Old's project, covering as it does not only what the Reformers and Counter-Reformers preached but also their reform of preaching itself. Old traces the main events and people involved in the development of preaching at this time — Luther, Calvin, Thomas of Villanova, Francis Xavier, William Perkins, John Donne, Johann Gerhard, Jacques Bossuet, and many more — while also giving due attention to how preaching was itself an act of worship.