Do you not see how in all animals certain signs appear before they proceed to mischief, and how their entire bodies put off their usual quiet appearance and stir up their ferocity? Boars foam at the mouth and sharpen their teeth by rubbing them against trees, bulls toss their horns in the air and scatter the sand with blows of their feet, lions growl, the necks of enraged snakes swell, mad dogs have a sullen look⁠—there is no animal so hateful and venomous by nature that it does not, when seized by anger, show additional fierceness. I know well that the other passions can hardly be concealed, and that lust, fear, and boldness give signs of their presence and may be discovered beforehand, for there is no one of the stronger passions that does not affect the countenance: what then is the difference between them and anger? Why, that the other passions are visible, but that this is conspicuous.