John Chrysostom
Catena Aurea · Johannesevangelium 18
And Simon Peter followed Jesus, and so did another disciple: that disciple was known unto the high priest, and went in with Jesus into the palace of the high priest. But Peter stood at the door without. Then went out that other disciple, which was known unto the high priest, and spake unto her that kept the door, and brought in Peter. Then saith the damsel that kept the door unto Peter, Art not thou also one of this man’s disciples? He saith, I am not. And the servants and officers stood there, who had made a fire of coals; for it was cold: and they warmed themselves: and Peter stood with them, and warmed himself.
(Serm. de Petro et Elia.) Therefore did Divine Providence permit Peter first to fall, in order that he might be less severe to sinners from the remembrance of his own fall. Peter, the teacher and master of the whole world, sinned, and obtained pardon, that judges might thereafter have that rule to go by in dispensing pardon. For this reason I suppose the priesthood was not given to Angels; because, being without sin themselves, they would punish sinners without pity. Passible man is placed over man, in order that remembering his own weakness, he may be merciful to others.