Plutarch Ad principem ineruditum 4

[4] Now it is true that Anaxarchus, trying to console Alexander in his agony of mind over his killing of Cleitus, said that the reason why Justice and Right are seated by the side ¹ of Zeus is that men may consider every act of a king as righteous and just; but neither correct nor helpful were the means he took in endeavouring to heal the king’s remorse for his sin, by encouraging him to further acts of the same sort. But if a guess about this matter is proper, I should say that Zeus does not have Justice to sit beside him, but is himself Justice and Right and the oldest and most perfect of laws; but the ancients state it in that way in their writings and teachings, to imply that without Justice not even Zeus can rule well. She is a virgin, according to Hesiod, ² uncorrupted, dwelling with reverence, self-restraint, and helpfulness; and therefore kings are called reverend, ³ for it is fitting that those be most revered who have least to fear. But the ruler should have more fear of doing than of suffering evil; for the former is the cause of the latter; and that kind of fear on the part of the ruler is humane and not ignoble to be afraid on behalf of his subjects lest they may without his knowledge suffer harm, not for their own sake but for the sake of those whom they are guarding. Epameinondas, when all the Thebans crowded to a certain festival and gave themselves up utterly to drink, went alone and patrolled the armouries and the walls, saying that he was keeping sober and awake that the others might be free to be drunk and asleep. And Cato at Utica issued a proclamation to send all the other survivors of the defeat to the seashore; he saw them aboard ship, prayed that they might have a good voyage, then returned home and killed himself; thereby teaching us in whose behalf the ruler ought to feel fear and what the ruler ought to despise. But Clearchus, tyrant of Pontus, used to crawl into a chest like a snake and sleep there, and Aristodemus of Argos would mount to an upper room entered by a trap-door, then put his bed on the door and sleep in it with his mistress; and the girl’s mother would take the ladder away from below and set it up again in the morning. How do you imagine he must have shuddered at the theatre, the city hall, the senate - chamber, the convivial feast, he who had made his bedchamber a prison cell? For in reality kings fear for their subjects, but tyrants fear their subjects; and therefore they increase their fear as they increase their power, for when they have more subjects they have more men to fear.