No sooner do I consider the One than I am enlightened by the radiance of the Three; no sooner do I distinguish them than I am carried back to the One. When I bring any One of the Three before my mind I think of him as a Whole, and my vision is filled, and the most of the Whole escapes me. I cannot grasp the greatness of that One in such a way as to attribute more 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 Nazianzen [c330-c390], Orationes 40.41, cited from T. F. Torrance, The Christian Doctrine of God, (T&T Clark, 1996), pg. 112
And I Quote… February 8