This volume is a compilation of messages given by noted Chinese pastor/author Watchman Nee at various times and places during his illustrious ministry. All relate to the communion of the Holy Spirit.
Great book. I'd recommend going through it more than once. Some of it tends to go over my head. But ask God to teach you as you're reading it. After going through it a couple times it really starts to make sense. It can really open your eyes and let the Holy Spirit do a greater work in you.