What is Prayer?

During his lifetime, Samuel Zwemer (18-67-1952) was alternately call the "Apostle to Muslims" and the "Apostle to Islam." Zwemer was one of the founders and pioneer missionaries of the Arabian Mission in the Arabian Gulf. He was a prolific author, writing mainly on the subjects of missions to Muslims, Islam, evangelism, and theology. This article provides a glimpse into the source of his passion for reaching Muslims with the gospel--his prayer life.