Paul Moore has been a student of revival for over forty years. As such, he has developed a passion to pray for God to "rend the heavens and come down!" (Isaiah 64:1) Originally a Masters' thesis, this work explores conditions before and after key revivals. Included are the Reformation, First Great Awakening, Great Revival (Second Great Awakening), Prayer Meeting Revival, and Welsh Revival. Scholarly, and yet readable, this well-researched treatise underscores the great need for God to revive us, yet again. It also inspires us to pray like never before for God to do what He has done before.