On Anger, Book III, XVII

So ferocious in their anger were those kings who had no learning, no tincture of polite literature: now I will show you King Alexander (the Great), fresh from the lap of Aristotle, who with his own hand while at table stabbed Clitus, his dearest friend, who had been brought up with him, because he did not flatter him enough, and was too slow in transforming himself from a free man and a Macedonian into a Persian slave.

Indeed he shut up Lysimachus, [44] who was no less his friend than Clitus, in a cage with a lion; yet did this make Lysimachus, who escaped by some happy chance from the lion’s teeth, any gentler when he became a king?

Why, he mutilated his own friend, Telesphorus the Rhodian, cutting off his nose and ears, and kept him for a long while in a den, like some new and strange animal, after the hideousness of his hacked and disfigured face had made him no longer appear to be human, assisted by starvation and the squalid filth of a body left to wallow in its own dung!

Besides this, his hands and knees, which the narrowness of his abode forced him to use instead of his feet, became hard and callous, while his sides were covered with sores by rubbing against the walls, so that his appearance was no less shocking than frightful, and his punishment turned him into so monstrous a creature that he was not even pitied.

Yet, however unlike a man he was who suffered this, even more unlike was he who inflicted it.