Short review: This is designed as a daily devotional on prayer. Written in 1915, it feels fairly modern most of the time. It was mentioned by Eugene Peterson in his memoir The Pastor. It has some unique thoughts about prayer and I found it a useful book to think differently about prayer, but I got distracted and did not finish. I will come back to it again late to finish the last 1/3.
My full thoughts on my blog at http://bookwi.se/prayer-fosdick/