We have found a direct correlation between grit and positive emotions, but the fact that I have no evidence that grit is bad for you doesn't mean it's not. It's always a possibility that in the future researchers will discover a downside to grit.
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About Angela Duckworth
Angela Duckworth was American psychologist. Angela Lee Duckworth is an American academic, psychologist, and popular science author. She is the Rosa Lee and Egbert Chang Professor of Psychology at the University of Pennsylvania, where she studies grit and self-control. Read more on Wikipedia →