This book is the first of two volumes setting out the biblical basis of prayer for the advance of God's Kingdom on earth. In the Foreword Lindsay writes: "The following is a series of lessons on prayer which will show you how to tap the resources of infinite power — power which can change the course of your life. These lessons reveal the secrets of men of God in past ages, down to our present day, who overcame all hindrances, and whose prayers have made history and helped to change the world of their generation."