Rabanus Maurus
Catena Aurea · Matthäusevangelium 9
And as Jesus passed forth from thence, he saw a man, named Matthew, sitting at the receipt of custom: and he saith unto him, Follow me. And he arose, and followed him. And it came to pass, as Jesus sat at meat in the house, behold, many Publicans and sinners came and sat down with him and his disciples. And when the Pharisees saw it, they said unto his disciples, Why eateth your Master with Publicans and sinners? But when Jesus heard that, he said unto them, They that be whole need not a physician, but they that are sick. But go ye and learn what that meaneth, I will have mercy, and not sacrifice: for I am not come to call the righteous, but sinners to repentance.
He calls Himself a physician, because by a wonderful kind of medicine He was wounded for our iniquities that He might heal the wound of our sin. By the whole, He means those who seeking to establish their own righteousness have not submitted to the true righteousness of God. By the sick, (Rom. 10:3.) He means those who, tied by the consciousness of their frailty, and seeing that they are not justified by the Law, submit themselves in penitence to the grace of God.