William Edwin Boardman (Deeper Life Higher Christian Life) is known of one of the foundational leaders of the Deeper Life or Higher Life Movement which promoted holy living. Boardman marks a break away of this movement from being exclusively with the Methodist-Wesleyan group, and he led many others in this movement, like D.L. Moody. This is a foundation book in the beginning of this movement. It is in three parts: What it is, How it is attained, and Progress and Power.
Calvin, John – Institutes of the Christian Religion
Calvin John – Institutes of the Christian Religion