R. A. Torrey 
The Person and Work of The Holy Spirit [EPUB ebook] 

Torrey’s book on the Holy Spirit is a solid Biblical exposition of the person of the Holy Spirit. Every Christian, especially those in denominations who are not as emphasizing the work of the Holy Spirit as other denominations, would benefit from reading this resource, as it places a solid emphasis of the importance of the Holy Spirit in a Christian’s life without going to any bizarre extremes.