John Piper's bestselling book on missions 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 readers with a sound theological foundation for missions. This 30th anniversary edition of a contemporary classic, now in paperback, incorporates insights from the author's refined thinking over the past 10 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 reading 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.