St. Gregory the Theologian, Oration 38, Section 10:
So therefore for these reasons the intelligible world was created, at least as far as I can investigate these matters, estimating great things by small discourse. And since the first world was beautiful to God, he thought a second material and visible world, that which is composed of heaven and earth and the system and composite of realities existing between them. It is praiseworthy because of the good disposition of each thing, but more praiseworthy because of the good connectedness and harmony of the whole, as each thing is well adapted to another and all to all, into the full realization of one world. Thus God has shown that he was able to create not only a nature akin to himself but also what is entirely foreign to him. For the intelligible natures and those apprehended only by the mind are akin to the divine, but those apprehended by the senses are entirely foreign to it, and those which are entirely without life or movement are still farther removed.
Yet perhaps one who is excessively ardent and devoted to feasts may ask, What are these things to us? Spur on your pony toward the goal post. Investigate for us what concerns the feast and the reasons why we sit before you today. Truly I will do this, even if I have begun with things a bit exulted, since my desire and my discourse have constrained.