For this reason those who cannot trust their digestion, when they are about to transact business of importance always allay their bile with food, for it is peculiarly irritated by fatigue, either because it draws the vital heat into the middle of the body, and injures the blood and stops its circulation by the clogging of the veins, or else because the worn-out and weakened body reacts upon the mind: this is certainly the reason why those who are broken by ill health or age are more irascible than other men. Hunger also and thirst should be avoided for the same reason; they exasperate and irritate men’s minds: it is an old saying that “a weary man is quarrelsome”: and so also is a hungry or a thirsty man, or one who is suffering from any cause whatever: for just as sores pain one at the slightest touch, and afterwards even at the fear of being touched, so an unsound mind takes offence at the slightest things, so that even a greeting, a letter, a speech, or a question, provokes some men to anger.