Robert J. Daly, S.J., is professor and director of graduate studies in the theology department of Boston College. He is the author, editor, or translator of numerous works including, Origen: Treatise on the Passover and Dialogue with Heraclides and His Fellow Bishops on the Father, the Son, and the Soul, Heinrich Fries's Fundamental Theology, and The Eucharist in the West: History and Theology.

This collection has been extremely well translated into English by Fr. Daly and to him a great debt of gratitude is due for having made available the thoughts of one of the greatest of ancient theologians as seen through the eyes of an almost equally prolific successor in the same central Christian enterprise." —Heythrop Journal