ONE MIGHT IMAGINE that the Stoics, because they go around contemplating worst-case scenarios, would tend toward pessimism. What we find, though, is that the regular practice of negative visualization has the effect of transforming Stoics into full-blown optimists. Allow me to explain. We normally characterize an optimist as someone who sees his glass as being half full rather than half empty. For a Stoic, though, this degree of optimism would only be a starting point. After expressing his appreciation that his glass is half full rather than being completely empty, he will go on to express his
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