" Negative visualization does not have these drawbacks. We don’t have to wait to engage in negative visualization the way we have to wait to be struck by a catastrophe. Being struck by a catastrophe can easily kill us; engaging in negative visualization can’t. And because negative visualization can be done repeatedly, its beneficial effects, unlike those of a catastrophe, can last indefinitely. "

― William B. Irvine , A Guide to the Good Life: The Ancient Art of Stoic Joy