Many Great Books on Prayer

A lot of great books on prayer can be downloaded at https://servantofmessiah.org/

The direct link is: https://servantofmessiah.org/prayer-ebooks/

The differing views on prayer in those books can help anyone develop their own theology and practices of prayer. I've also posted some books on prayer on my own blog here. For example, one of my favorite books on prayer, The Life of Prayer by A.B. Simpson. Also J.C. Ryle's A Call To Prayer.