And having been first chastened by many means …. at last [man] needed a stronger remedy, for his diseases were growing worse; mutual slaughters, adulteries, perjuries, unnatural crimes, and that first and last of all evils, idolatry and the transfer of worship from the Creator to the Creatures. As these required a greater aid, so also they obtained a greater. And that was that the Word of God Himself — Who is before all worlds, the invisible, the incomprehensible, the bodiless, beginning of beginning, the light of light, the source of life and immortality, the image of the archetypal beauty, the immovable seal, the unchangeable image, the Father's definition and Word, came to His own image, and took on Him flesh for the sake of our flesh, and mingled Himself with an intelligent soul for my soul's sake, purifying like by like; and in all points except sin was made man ….
O new commingling; O strange conjunction; the Self-Existent comes into being, the Uncreate is created, That which cannot be contained is contained, by the intervention of an intellectual soul, mediating between the Deity and the corporeity of the flesh. And He who gives riches becomes poor, for He assumes the poverty of my flesh, that I may assume the richness of His Godhead ….
What is this mystery that is around me? I had a share in the image; I did not keep it; He partakes of my flesh that He may both save the image and make the flesh immortal.
-- Gregory Nazianzen, Oration 38, On the Theophany, or Birthday of Christ