The Deeper Christian Life by Andrew Murray
Andrew Murray was a prominent South African pastor and Christian writer in the late 19th and early 20th centuries. Murray's belief in faith healing and the continuation of the apostolic gifts made him one of the key figures in the Pentecostal movement. Murray wrote over 200 books and many of them, such as the devotionals Abide in Christ, Absolute Surrender, and Humility, are considered Christian classics.
This is an excellent devotional that helps Christians in their walk with Christ.