John Piper's bestselling book on missions (more than 300,000 copies sold) draws on key biblical texts to demonstrate that worship is the ultimate goal of the church and that proper worship fuels missionary outreach. Piper offers a biblical defense of God's supremacy in all things, providing listeners with a sound theological foundation for missions. This thirtieth anniversary edition of a contemporary classic incorporates insights from the author's refined thinking over the past ten years. Used extensively as a textbook for missions courses and a resource for ministries, Let the Nations Be Glad! provides a passionate plea for God-centeredness in the whole enterprise of world evangelization and explores the role of prayer and spiritual warfare. The book is essential for those involved in or preparing for missions work. It also offers enlightenment for students, pastors, youth workers, campus ministers, and all who want to connect their labors to God's global purposes.