Origen, on Matt 18:10

“See that you despise not one of these little ones: for I say to you, that their angels in heaven always see the face of my Father who is in heaven.”

“Some will have it that an Angel is given as an attendant minister from the time when in the laver of regeneration the infant is born in Christ; for, say they, it is incredible that a holy Angel watches over those who are unbelieving and in error, but in his time of unbelief and sin man is under the Angels of Satan. Others will have it, that those who are foreknown of God, have straightway from their very birth a guardian Angel.”

Imported from an open dataset — not yet checked against the printed edition.