This mobilization usually comes with feelings of craving; these range from quiet longings to a desperate sense of compulsion. It is interesting that the word for craving in Pali—the language of early Buddhism—is tanha, the root of which means thirst. The word “thirst” conveys the visceral power of threat signals, even when they have nothing to do with life or limb, such as the possibility of being rejected. Threat signals are effective precisely because they’re unpleasant—because they make you suffer, sometimes a little, sometimes a lot. You want them to stop.