This short, readable book discusses the importance of the doctrine of the Trinity for contemporary faith. In clear, understandable language, it explores the development of the doctrine of the Trinity in church history, discusses modern issues and developments, and speaks practically about the significance of this doctrine for the Christian life. The Foundations of Christian Faith series enables readers to learn about contemporary theology in ways that are clear, enjoyable, and meaningful. It examines the doctrines of the Christian faith and stimulates readers not only to think more deeply about their faith but also to understand their faith in relationship to contemporary challenges and questions. Individuals and study groups alike will find these guides invaluable in their search for depth and integrity in their Christian faith.