Considered by his peers then and now as "The Prince of Preachers," Charles Spurgeon built London's Metropolitan Tabernacle into the world's largest independent congregation during the nineteenth century. While many factors have been highlighted that help explain the effectiveness of Spurgeon's preaching, the foremost secret that empowered Charles Spurgeon was his devotion to prayer.
When people would walk through the Metropolitan Tabernacle, Spurgeon would take them to the basement prayer room where people were always on their knees interceding for the church. Then Spurgeon would declare, "Here is the powerhouse of this church." That statement is backed by the amazing number of sermons that Spurgeon preaced on prayer.
Spurgeon was a great believer and teacher in passionate, Holy Spirit-directed prayer. His word pictures of the majestic throne of grace that God calls believers to be privileged to come before is well worth the price of the book alone. You will be inspired and challenged in your prayer life, especially if you experience struggles in prayer. [via]