Assay: Lately, I’ve been thinking a lot about the important role of negative emotions in a happy life.

Some people seem to believe that the purpose of a happiness project would be to achieve a life in which you were 100% happy, 100% of the time. This isn’t realistic, and in any event, even if it were possible, it wouldn’t be desirable.

Negative emotions are a key part of rational thought and effective performance. Also, up to a point, they can be of great service to happiness. They’re loud, flashy signs that something isn’t right. Because they’re so unpleasant, they can sometimes prod us to take action when nothing else can. For instance, envy and deception have helped me to make useful changes in my life.

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