From Saint Augustine, via dailygospel.org:
Christ was to come in our flesh, not another, neither angel nor ambassador, Christ himself was to come to save us (Is 35,4)… He was to be born in mortal flesh: a baby laid in a crib, wrapped in swaddling bands, suckled, who would grow up as the years passed by and would die cruelly at the end. These are so many testimonies of deep humility. Who is giving us these examples of humility? The Most High.
What is his greatness, then? Do not look on earth, rise above the stars. When you have reached as far as the legions of angels, you will hear them say: “Rise up still higher above us”. When you have risen up to Thrones, Dominations, Principalities and Powers (Col 1,16), you will hear them say again: “Rise up higher, we ourselves are creatures”, “for all things were made by him” (Jn 1,3). So raise yourself above every creature, everything that has been formed, everything that has received its existence, all beings that change, whether corporeal or incorporeal, in a word above everything. Your sight cannot yet reach that far; it is by faith you must rise up there, it belongs to faith to lead you up to the Creator… There you will behold “the Word who was in the beginning”…Now this Word that was in God, this Word that was God, through whom all things were made and without whom nothing was made, in whom was life: he has come down to us. What were we? Did we deserve him to come to us? No, we were unworthy of his having compassion on us but he was worthy of taking pity on us.