The Heart of the Gospel is a book written by James M. Campbell in 1907. The book is a popular exposition of the doctrine of the atonement, which is a central belief in Christianity. The author explains the concept of the atonement, which is the idea that Jesus Christ died for the sins of humanity, and how it is a vital part of the Christian faith. The book is written in a simple and easy-to-understand language, making it accessible to a wide range...