The book "The Letters of John Calvin, Volume II. Collected from the Original Manuscripts and Edited with Historical Notes" is a valuable resource for understanding and researching the activities and thoughts of the great reformer John Calvin. This edition features original letters written by Calvin himself, which help to better understand his teachings, reasoning, and interactions with his contemporaries. The editors of the publication add historical notes that place the letters read in the context of their writing and the general context of the religious and cultural events of that time. This book is an essential resource for anyone interested in John Calvin, his theology, and his influence on the birth and development of Protestantism.