12 For since it was impossible that perishable bodies, or the rational spirits which he had created, should approach the Supreme God, by reason of their immeasurable distance from his perfections, for he is unbegotten, above and beyond all creation, ineffable, inaccessible, unapproachable, dwelling, as his holy word assures us, in the light which none can enter; but they were created from nothing, and are infinitely far removed from his unbegotten Essence; well has the all-gracious and Almighty God interposed as it were an intermediate Power between himself and them, even the Divine omnipotence of his only-begotten Word. And this Power, which is in perfect nearness and intimacy of union, with the Father which abides in him, and shares his secret counsels, has yet condescended, in fullness of grace, as it were to conform itself to those who are so far removed from the supreme majesty of God. How else, consistently with his own holiness could he who is far above and beyond all things unite himself to corruptible and corporeal matter? Accordingly the Divine Word, thus connecting himself with this universe, and receiving into his hands the reins, as it were, of the world, turns and directs it as a skillful charioteer according to his own will and pleasure.
13. The proof of these assertions is evident. For supposing that those component parts of the world which we call elements, as earth, water, air, and fire, the nature of which is manifestly without intelligence, are self-existent; and if they have one common essence, which they who are skilled in natural science call the great receptacle, mother, and nurse of all things; and if this itself be utterly devoid of shape and figure, of soul and reason; whence shall we say it has obtained its present form and beauty? To what shall we ascribe the distinction of the elements, or the union of things contrary in their very nature? Who has commanded the liquid water to sustain the heavy element of earth? Who has turned back the waters from their downward course, and carried them aloft in clouds? Who has bound the force of fire, and caused it to lie latent in wood, and to combine with substances most contrary to itself? Who has mingled the cold air with heat, and thus reconciled the enmity of opposing principles? Who has devised the continuous succession of the human race, and given it as it were an endless term of duration? Who has moulded the male and female form, adapted their mutual relations with perfect harmony, and given one common principle of production to every living creature? Who changes the character of the fluid and corruptible seed, which in itself is void of reason, and gives it its prolific power? Who is at this moment working these and ten thousand effects more wonderful than these, nay, surpassing all wonder, and with invisible influence is daily and hourly perpetuating the production of them all?
14. Surely the wonder-working and truly omnipotent Word of God may well be deemed the efficient cause of all these things: that Word who, diffusing himself through all creation, pervading height and depth with incorporeal energy, and embracing the length and breadth of the universe within his mighty grasp, has compacted and reduced to order this entire system, from whose unreasoned and formless matter he has framed for himself an instrument of perfect harmony, the nicely balanced chords and notes of which he touches with all-wise and unerring skill. He it is who governs the sun, and moon, and the other luminaries of heaven by inexplicable laws, and directs their motions for the service of the universal whole.
15. It is this Word of God who has stooped to the earth on which we live, and created the manifold species of animals, and the fair varieties of the vegetable world. It is this same Word who has penetrated the recesses of the deep, has given their being to the finny race, and produced the countless forms of life which there exist. It is he who fashions the burden of the womb, and informs it in nature's laboratory with the principle of life. By him the fluid and heavy moisture is raised on high, and then, sweetened by a purifying change, descends in measured quantities to the earth, and at stated seasons in more profuse supply.
16. Like a skillful husbandman, he fully irrigates the land, tempers the moist and dry in just proportion, diversifying the whole with brilliant flowers, with aspects of varied beauty, with pleasant fragrance, with alternating varieties of fruits, and countless gratifications for the taste of men. But why do I dare essay a hopeless task, to recount the mighty works of the Word of God, and describe an energy which surpasses mortal thought? By some, indeed, he has been termed the Nature of the universe, by others, the World-Soul, by others, Fate. Others again have declared him to be the most High God himself, strangely confounding things most widely different; bringing down to this earth, uniting to a corruptible and material body, and assigning to that supreme and unbegotten Power who is Lord of all an intermediate place between irrational animals and rational mortals on the one hand, and immortal beings on the other.
Source: Oration in Praise of Constantine (New Advent)