This book has become known as one of the best reference books for theology on the subject of missions, for pastors, missionaries, and seminary students as well as for all believers in general. Piper builds a biblical and theological case defending the Sovereignty of God above all things, in this revised and extended edition. Using texts from the Old and New Testaments, Piper demonstrates that praise is the ultimate goal of the church, and that a proper praise leads to missionary action. He says that prayer is the fuel of missionary work because it is based on a relationship with God and not so much on the needs of the world. He also talks about the suffering that is often experienced in the world of missions, adding that this suffering is worth the pain. He does not forget to discuss the debate on whether Jesus is the only way of salvation, and delves into the enormous missionary enterprise to discover the work still to be done and the resources available for carrying the Gospel to "all the nations."