John Chrysostom — as excerpted in the Catena Aurea on Matthew 18:23-35

“See the exuberance of heavenly love! The servant asked only a brief respite, but he gives him more than he had asked, a full remittance and cancelling of the whole debt. He was minded to have forgiven him from the very first, but he would not have it to be of his own mere motion, but also of the other’s suit, that he might not depart without a gift. But he did not remit the debt till he had taken account, because he would have him know how great debts he set him free of, that by this he should at the least be made more merciful to his fellow servants. And indeed as far as what has gone he was worthy to be accepted; for he made confession, and promised that he would pay the debt, and fell down and begged, and confessed the greatness of his debt. But his after deeds were unworthy of the former, for it follows, But the same servant went out, and found one of his fellow-servants which owed him a hundred denarii.”