Ambrose of Milan
Catena Aurea · Lukasevangelium 9
Then there arose a reasoning among them, which of them should be greatest. And Jesus, perceiving the thought of their heart, took a child, and set him by him, And said unto them, Whosoever shall receive this child in my name receiveth me: and whosoever shall receive me receiveth him that sent me: for he that is least among you all, the same shall be great. And John answered and said, Master, we saw one casting out devils in thy name; and we forbad him, because he followeth not with us. And Jesus said unto him, Forbid him not: for he that is not against us is for us.
For he who receives the followers of Christ, receives Christ; and he who receives the image of God, receives God; but because we cannot see the image of God, it has been made present to us by the incarnation of the Word, that the divine nature which is above us, may be reconciled to us.