How to Think Rightly about the Triunity of God

Gregory Nazianzen:

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.

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.

—Gregory of Nazianzen, Orationes, 40:41