Origen
Catena Aurea · Lukasevangelium 2
And suddenly there was with the angel a multitude of the heavenly host praising God, and saying, Glory to God in the highest, and on earth peace, good will toward men.
But in a mystery, the Angels saw that they could not accomplish the work committed to them without Him Who was truly able to save, and that their healing fell short of what the care of men required.And so it was as if there should come one who had great knowledge in medicine, and those who before were unable to heal, acknowledging now the hand of a master, grudge not to see the corruptions of wounds ceasing, but break forth into the praises of the Physician, and of that God who sent to them and to the sick a man of such knowledge; the multitudes of the Angels praised God for the coming of Christ.