Jessie Penn-Lewis gives an overview of the Welsh Revival in this book. The principles emphasized in this book for baptism in the Holy Spirit and fire are unity of believers, prayer, experience of death to self, forsaking sins etc. Challenges one to yearn for the christian experience where rivers of living water flows from the innermost being of a believer. Recommend for those who long for the fullness of the Holy Spirit in the individual life and the christian group which they are part of.