Every good deed has such aspects, but they are not clear to everyone. They must be shown, and by them the person must be exhorted to do the deed.
For the one for whom even this is not enough, there remains only action by the force of reproof, shame, rebuke, and authority. Such a one, he says, “rebuke with all command.”
“First speak and exhort, that is, teach with a gentler word. Then rebuke, and not simply, but with all command, that is, insistently and authoritatively,” says blessed Theophylact.
“He used three verbs: speak, exhort, rebuke. ‘Speak’ seems to refer to simple teaching. As for ‘exhort,’ it means the same as in the words: ‘We exhort on behalf of Christ,’ 2 Cor 5:20. There the teacher humbles and lowers himself as though he were a petitioner, so as only to gain the one whom he persuades. The third, ‘rebuke,’ is appropriate after persuasion. Those who despise exhortation are worthy of rebuke and deserve to hear: ‘You have forgotten the exhortation which speaks to you as to sons,’ cf. Heb 12:5. Writing to Timothy, the Apostle placed rebuke before exhortation: ‘rebuke, exhort,’ cf. 2 Tim 4:2. Here he desires that the disciples first be exhorted, and then rebuked only when exhortation remains fruitless. They are to be rebuked with all command. This ‘with all command’ refers only to rebuke, not to the first two, that is, teach and exhort. For one cannot say, exhort with all command, or speak with all command, but only, rebuke with all command,” says blessed Jerome.
Saint Chrysostom explains the difference in the forms of instructive speech by the difference in the subjects. “There are sins from which one must turn men away by commands. In persuading them to despise wealth, to be obedient, and the like, one must exhort. But one must correct an adulterer, fornicator, and greedy man with command. The sorcerer, magician, and people of that kind must be rebuked not simply with command, but with all command. Do you see with what force and what great authority he commands Titus to act?”
Here one may see a prescription for the pastor: do not sleep, but act. Use every measure to compel your flock to live as they ought.
“Let no one despise you.” If you do not teach, exhort, and rebuke with authority, then the disorderly will finally do every unseemly thing before your eyes. They will think and say: why pay attention to him? He will say nothing.
Even if you yourself are upright in life, yet if you neglect your flock, all will begin to despise you and count you as nothing. He is not suggesting that Titus avoid giving occasion for contempt by his own life. Rather, he must not, by negligence toward his pastoral duty, give his flock freedom to regard him as nothing.
For this reason the verb used is μηδεις σου περιφρονειτω. Let no one despise you, not for what is in you or in your character, but for what is around you and upon you. That is, for your negligence in teaching, exhorting, and rebuking your flock.