Holy Triad

No sooner do I conceive of the One than I am illumined by the splendor of the Three; no sooner do I distinguish them than I am carried back to the One. When I think of any One of the Three, I think of Him as the whole, and my eyes are filled, and the greater part of what I am thinking of escapes me. I cannot grasp the greatness of that One so as to attribute a greater greatness to the rest. When I contemplate the Three together, I see but one torch, and cannot divide or measure out the undivided light.

You ask, “What is the procession of the Holy Spirit?” Tell me first, what is the unbegottenness of the Father, and I will then explain to you the physiology of the generation of the Son, and the procession of the Spirit, and we shall both of us be stricken with madness for prying into the mystery of God.

—Gregory Nazianzus