Plato's Seventh Letter on Socrates in court

So when I beheld all these actions and others of a similar grave kind, I was indignant, and I withdrew myself from the evil practices then going on. But in no long time the power of the Thirty was overthrown together with the whole of the government which then existed. Then once again I was really, though less urgently, impelled with a desire to take part in public and political affairs. Many deplorable events, however, were still happening in those times, troublous as they were, and it was not surprising that in some instances, during these revolutions, men were avenging themselves on their foes too fiercely; yet, notwithstanding, the exiles who then returned exercised no little moderation.

The quote: But, as ill-luck would have it, certain men of authority summoned our comrade Socrates before the law-courts, laying a charge against him which was most unholy, and which Socrates of all men least deserved;

for it was on the charge of impiety that those men summoned him and the rest condemned and slew him—the very man who on the former occasion, when they themselves had the misfortune to be in exile, had refused to take part in the unholy arrest of one of the friends of the men then exiled. When, therefore, I considered all this, and the type of men who were administering the affairs of State, with their laws too and their customs, the more I considered them and the more I advanced in years myself, the more difficult appeared to me the task of managing affairs of State rightly.