This fifth volume of Joannis Calvini Opera Selecta offers an essential collection of primary texts from one of history's most influential theologians. John Calvin’s work continues to shape modern Christian thought, and this volume provides students, scholars, and church leaders with a vital resource for exploring his theological development and academic rigour. Compiled with the expertise of Petrus Barth and Guilelmus Niesel, these selections remain a staple for any serious study of the Reformation. Whether you are conducting academic research or seeking a deeper understanding of the foundations of Protestant tradition, this volume presents a critical window into the mind of Calvin. These texts serve as an indispensable guide for anyone navigating the history of theology and the enduring impact of Calvin's life and letters on the global Church.