For as when a figure painted on wood has been soiled by dirt from outside, it is necessary for him whose figure it is to come again, so that the image can be renewed on the same material—because of his portrait even the material on which it is painted is not cast aside, but the portrait is reinscribed on it. In the same way the all-holy Son of the Father, being the Image of the Father, came to our place to renew the human being made according to himself, and to find him, as one lost, through the forgiveness, as himself says in the Gospels, “I came to seek and save the lost” (Lk 19.10)…. So, rightly wishing to help human beings, he sojourned as a human being, taking to himself a body like theirs and from below—I mean through the works of the body—that those not wishing to know him from his providence and governance of the universe, from the works done through the body might know the Word of God in the body, and through him the Father….
Now then, if they ask why he did not appear through other more noble parts of creation, or use some nobler instrument, as the sun or moon or stars or fire or air, but merely a human being, let them know that the Lord came not to be put on display but to heal and to teach those who were suffering. One being put on display only needs to appear and dazzle the beholders; but one who heals and teaches does not simply sojourn, but is of service to those in need and appears as those who need him can bear, lest by exceeding the need of those who suffer he trouble the very ones in need and the manifestation of the divine be of no benefit to them….
Properly, therefore, the Word of God took a body and used a human instrument, in order to give life to the body and in order that, just as he is known in creation by his works, so also he might act in a human being, and show himself everywhere, leaving nothing barren of his divinity and knowledge. Again, I repeat, resuming what we said before, that the Savior did this in order that as he fills everything everywhere by his presence, so also he might fill all things with the knowledge of himself, as the divine scriptures say, ‘The whole earth was filled with the knowledge of God’ (Isa 11.9).
—St. Athanasius, On The Incarnation, 14, 43, 45.