" The Stoics, as we have seen, advise us to pursue tranquility, and as part of their strategy for attaining it they advise us to engage in negative visualization. But isn’t this contradictory advice? Suppose, for example, that a Stoic is invited to a picnic. While the other picnickers are enjoying themselves, the Stoic will sit there, quietly contemplating ways the picnic could be ruined: “Maybe the potato salad is spoiled, and people will get food poisoning. Maybe someone will break an ankle playing softball. Maybe there will be a violent thunderstorm that will scatter the picnickers. Maybe I will be struck by lightning and die.” This sounds like no fun at all. But more to the point, it seems unlikely that a Stoic will gain tranquility as a result of entertaining such thoughts. To the contrary, he is likely to end up glum and anxiety-ridden.
In response to this objection, let me point out that it is a mistake to think Stoics will spend all their time contemplating potential catastrophes. It is instead something they will do periodically: A few times each day or a few times each week a Stoic will pause in his enjoyment of life to think about how all this, all these things he enjoys, could be taken from him.
Furthermore, there is a difference between contemplating something bad happening and worrying about it. Contemplation is an intellectual exercise, and it is possible for us to conduct such exercises without its affecting our emotions. It is possible, for example, for a meteorologist to spend her days contemplating tornadoes without subsequently living in dread of being killed by one. In similar fashion, it is possible for a Stoic to contemplate bad things that can happen without becoming anxiety-ridden as a result.
Finally, 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. "
― William B. Irvine
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