There is absolutely no substitute for prayer. Great preaching will not take its place, nor a D.D. or a Ph.D., nor a winsome personality, nor a well-planned and executed promotional program, nor anything else. Call the roll of history's spiritual giants and you will find that all were given to much prayer. You will find in this volume a new appreciation of the mighty power of prayer and a new understanding of the place prayer should have in our lives. You will learn again that prayer is the key that unlocks God's treasure-house. From God's choicest servants you can learn that through prayer, we can claim the world through Christ.