The book of Exodus, along with its predecessor, Genesis, is fundamental to the formation of biblical theology. Here much of the nature and character of God, as well as that of humanity is displayed. But the special contribution of Exodus is to the theology of salvation. Here we learn of the need for salvation, its nature, its means, and its intended outcome. A proper understanding of the book's teachings on these matters will go far toward explaining NT truth, while an improper understanding has again and again provided fertile soil for heresy.