13 A fourth reason is, that you have disgraced him who is ill reported; and hast thus rendered him more shameless than he was, by placing him in a state of enmity and hostility. Fifthly, you have made yourself liable to chastisement and vengeance; by involving yourself in matters which in no way concerned you. For let not any one tell me in reply, “Then I am an evil speaker when I speak falsely, but if I speak what is true, I cease to be so.” Although it be with truth you speak evil, this also is a crime.
For that Pharisee spoke evil of the Publican with truth; but nevertheless this availed him not. For was not the latter, I ask, a publican and a sinner? It is manifest to every one that he was a publican. But at the same time inasmuch as the Pharisee spoke ill of him, he departed from the temple with the loss of every advantage. Do you wish to correct a brother? Weep; pray unto God; taking him apart, admonish, counsel, entreat him! So also Paul did, “Lest,” says he, “when I come again, my God will humble me among you, and I shall bewail many which have sinned already, and have not repented of the uncleanness and fornication and lasciviousness which they have committed.” Show your charity towards the sinner.
Persuade him that it is from care and anxiety for his welfare, and not from a wish to expose him, that you put him in mind of his sin. Take hold of his feet; embrace him; be not ashamed, if you truly desirest to cure him. Physicians too do things of this sort, oftentimes, when their patients are hard to please; by embraces and entreaties they at length persuade them to take a salutary medicine. Thus also do thou. Show the wound to the priest; that is the part of one who cares for him, and provides for him, and is anxious on his behalf.
Source: Homilies on the Statues (New Advent)