Trinitarian theology sits at the heart of Christian doctrine, yet how many believers understand this foundational truth of the faith? Perhaps more importantly, how many believers understand what is at stake in holding to a biblical understanding of this core tenet of the faith? In this primer on Trinitarian theology, readers are invited to ask forty pertinent questions, including: What is the Trinity? Why is it important for Christians to know the doctrine of the Trinity? What does the Bible teach us about the Trinity? What happened to the Trinity at the cross? How do we apply the doctrine of the Trinity to the Christian life? Ultimately, questions about the Trinity are questions about God. Taking the time to prayerfully explore and answer such questions will lead one to a deeper knowledge of him. In 40 Questions About the Trinity , readers will find helpful and encouraging guidance for this endeavor.