In this book we see how Malachi describes the spiritual illness in the U.S. and certain other materially "developed" nations today. The symptoms reveal their obvious cause. Malachi goes further to reveal the often unseen source of the obvious cause. This is like the unseen flu virus or malaria parasite causing an illness, which can be an obvious cause of chills, fever, muscle aches, and more. Malachi establishes all of this for the spiritual illness today, and then shows God's cure for this otherwise incurable spiritual illness. Malachi also shows what God's people need to do to move into and become a part of His cure for these nations.