negative visualization, rather than making people glum, will increase the extent to which they enjoy the world around them, inasmuch as it will prevent them from taking that world for granted. Despite—or rather, because of—his (occasional) gloomy thoughts, the Stoic will likely enjoy the picnic far more than the other picnickers who refuse to entertain similarly gloomy thoughts; he will take delight in being part of an event that, he fully realizes, might not have taken place.
