"Belief in the Trinity is at the heart of Christian faith and life," states eminent theologian, educator and author Gerald O"Collins. But many Christians have questions about what the Trinity is and why we believe in a Trinitarian God. Here, O"Collins explores the mystery of the Trinity in an academic, practical and prayerful way. Writing in his characteristic clear and concise prose, O"Collins draws on three areas for reflection. First he examines the testimony to the tripersonal God in the Scriptures, both the Old Testament background and in the teachings of Paul and the gospel writers. Then he deals with patristic, conciliar and subsequent teaching about the Trinity. Finally, he looks at contemporary thinking on Trinitarian issues, including the personal existence of the Holy Spirit, naming the Trinity as Father, Son and Spirit, and images of the Trinity. Highlights: o A good, solid introduction to the Trinity, perfect for college courses. o The author has a wonderful reputation and name recognition. o The most up-to-date treatment of the Trinity.