I am a new member here and would like to 'shamelessly promote' my book. It is called Five Smooth Stones for Prayer Warriors, and it examines the prayer in Acts 4:23-31, noting five principles that underlie how those early Christians cried out to God during a time of intense trial. If you find your mind wandering when you pray (who doesn't?), or if you long to pray with greater depth, you might find the principles discussed in this book helpful. There is a link on my website/blog that will lead you to where you may purchase the paperback or the ebook. If you should do so, thank you very much, and I pray you are blessed and encouraged.
www.markdrinnenberg.com