Two classic books written by A. B. Simpson, founder of The Christian Missionary Alliance.
The Life of Prayer
Chapter 1 - The Pattern Prayer
Chapter 2 - Encouragements to Prayer
Chapter 3 - In His Name
Chapter 4 - The Prayer of Faith
Chapter 5 - Hindrances to Prayer
Walking in The Spirit
Chapter 1 - Living in the Spirit
Chapter 2 - Walking in the Spirit
Chapter 3 - Person and Attributes of the Holy Ghost
Chapter 4 - Offices and Relations of the Holy Ghost
Chapter 5 - Emblems and Aspects of the Holy Spirit
Chapter 6 - The Spirit of Light
Chapter 7 - The Spirit of Holiness
Chapter 8 - The Spirit of Life
Chapter 9 - The Spirit of Comfort
Chapter 10 - The Spirit of Love
Chapter 11 - The Spirit of Power
Chapter 12 - The Spirit of Prayer
Chapter 13 - Cooperating With the Holy Ghost
Chapter 14 - Hindering the Holy Spirit