John Chrysostom
Catena Aurea · Matthäusevangelium 18
Moreover if thy brother shall trespass against thee, go and tell him his fault between thee and him alone: if he shall hear thee, thou hast gained thy brother. But if he will not hear thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established. And if he shall neglect to hear them, tell it unto the Church: but if he neglect to hear the Church, let him be unto thee as an heathen man and a Publican.
We are to tell his fault to the man himself who did it, and not to another, because the party takes it with the more patience from him, and above all when they are together alone. For when he who had a right to demand reparation, shews rather a carefulness to heal the sore, this has great power to propitiate.