Photo: Melinda Josie

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Ellen Langer, PhD, professor of psychology, Harvard University
"We have a tendency to confuse the stability of our mind-sets with the stability of the world. We hold something still with our heads, believing we know it, but it's changing regardless of how we perceive it. If you can notice things changing, you'll be less gutted by change. And whether or not you feel gutted by the change won't alter the outcome—it's still happening. Stress is a function of the views we take of events, not of the events themselves."