The Mystery of the Trinity

In chapter 17 of the first book of his Institutes of the Christian Religion, John Calvin expresses his delight in this passage written by the fourth-century Cappadocian church father Gregory of Nazianzus. Specifically, Calvin points to the following sentence: “No sooner do I conceive of the One than I am illumined by the Splendour of the Three; no sooner do I distinguish them than I am carried back to the One.” Why does John Calvin find joy in these words? Calvin understands that contemplating our triune God exposes us to a truth that surpasses our total comprehension. He knew that to avoid error in our thoughts and words about God, we must be careful. Gregory of Nazianzus (AD 329–390) was one of the greatest theologians of the early church. He was instrumental in the resolution of the fourth-century Trinitarian crisis that engulfed the church. Certain of his writings, particularly Orations 20, 23, 25 and the five theological orations (27–31), are foundational works in the history of T...