Against Alcibiades (40-41)

However, it is not the mere exaction of punishment from wrongdoers themselves that should be your object; you should seek also to render everyone else more upright and more self-controlled by the sight of that punishment. If, then, you send me into exile, you will strike fear into all men of worth. If, on the other hand, you punish Alcibiades, you will inspire a greater respect for the law in those whose insolence is uncontrolled.

I wish, further, to remind you of what I have done. I have been sent on missions to Thessaly, to Macedonia, to Molossia, to Thesprotia, to Italy, and to Sicily. In the course of them I have reconciled such as had quarrelled with you, others I have won over to friendship, others I have detached from your enemies. If every representative of yours had done the same, you would have few foes, and you would have gained many an ally.