Plutarch, Cato the Younger
Bernadotte Perrin, Ed.

21. At first, then, Cato had only a few of his friends about him; but when his purpose became known, in a little while all the men of worth and note flocked to him with exhortations and encouragements. They felt that he was not receiving a favour, but conferring the greatest favour on his country and the most reputable of his fellow citizens; for he had often refused the office when he could have had it without trouble, and now sued for it at his peril that he might contend for the liberties of the state. [2] It is said, moreover, that he was in peril from the many who crowded upon him in their zeal and affection, and could hardly make his way for the crowd into the forum. He was declared tribune with others¹ (including Metellus), and seeing that the consular elections were attended with bribery, he berated the people; and in concluding his speech he swore that he would prosecute the briber, whoever he might be, making an exception only of Silanus because of their relationship. For Silanus was the husband of Cato's sister Servilia. [3] For this reason he let Silanus alone, but he prosecuted Lucius Murena on the charge of having secured his election to the consulship with Silanus by bribery.² Now, there was a law by which the defendant could set a man to watch the prosecutor, in order that there might be no secret about the material which he was collecting and preparing for the prosecution. Accordingly, the man appointed by Murena to watch Cato would follow him about and keep him under observation. [4] When, however, he saw that Cato was doing nothing insidiously or unjustly, but was honourably and considerately following a straightforward and righteous course in the prosecution, he had such admiration for Cato's lofty spirit and noble character that he would come up to him in the forum or go to his house and ask him whether he intended that day to attend to any matters connected with the prosecution; and if Cato said no, the man would take his word and go away.

[5] When the trial was held, Cicero, who was consul at that time and one of Murena's advocates, took advantage of Cato's fondness for the Stoics to rail and jest at length about those philosophers and what were called their ‘paradoxes,’ thus making the jurors laugh. Cato, accordingly, as we are told, said with a smile to the bystanders: ‘My friends, what a droll fellow our consul is!’ [6] And after Murena had been acquitted, he did not feel towards Cato as a base or senseless man might have done; for during his consulship he asked his advice in the most important matters, and in other ways constantly showed him honour and trust. And Cato himself was responsible for this; on the tribunal and in the senate he was severe and terrible in his defence of justice, but afterwards his manner towards all men was benevolent and kindly.