This book was published in 1997, at a time when the church was experiencing some outbreaks of revival. I found it filled with principles that are important today for the church. Goll urges the church to be serious about intercession, praying to change the world for Christ, and he cites a most historical event to point to the effective of intercessory prayer. The Moravian prayer warriors of the eighteenth century offered unbroken prayer for 24 hours a day, seven days a week, every day of the week for over 100 years. Through these prayers great things were accomplished. They had a tremendous effect on the Great Awakening and especially John Wesley. The book is filled with Bible references and quotes from great leaders of the faith concerning prayer. It is definitely a call to Christians to take our roles of intercessors seriously.