A historical and systematic introduction to what the medieval philospher and theologian Thomas Aquinas (1225-74) said about faith in the Trinity. Gilles Emery, O.P., provides an explanation of the main questions in Thomas's treatise on the Trinity in his major work, the Summa Theologiae. His presentation clarifies the key ideas through which Thomas accounts for the nature of Trinitarian monotheism. Emery focuses on the personal relations of the Father, Son, and Holy Spirit, both in their eternal communion and in their creative and saving action. By highlighting the thought of one of...

This handbook examines the history of Trinitarian theology and reveals the Nicene unity still at work among Christians today despite ecumenical differences and the variety of theological perspectives. The forty-three chapters are organized into the following seven parts: the Trinity in Scripture, Patristic witnesses to the Trinitarian faith, Medieval appropriations of the Trinitarian faith, the Reformation through to the 20th Century, Trinitarian Dogmatics, the Trinity and Christian life, and Dialogues (addressing ecumenical, interreligious, and cultural interactions).

The phrase...