[The light], which bestows on the things that see and that are seen both the power of seeing and the power of being seen, is itself the most beautiful of visible things. So it is also with the God who created both the power of thinking and the power of being thought of. For those who think and for that which is thought of, God is the highest of the objects of thought, in whom every desire finds its goal and beyond whom it cannot go any further. For not even the most philosophical, the most piercing, or the most curious intellect has a more exalted object than this, nor can it ever have one. This, then, is the utmost of things desirable, and those who arrive at it find a total rest from speculation.
-Gregory of Nazianzus, Oration 21.1 (SC 270:112)