"No one who is in a state of fear or sorrow or tension is free, but whosoever is delivered from sorrows or fears or anxieties is at the same time delivered from servitude."

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I began studying human emotions more than twenty years ago. At that time, almost every scientist working in this area was studying one of the negative emotions, like fear, anger, anxiety, or depression. I wondered why no scientists cared to explain why we humans sometimes feel upbeat and pleasant. I liked the idea of charting new terrain. It's been a fun intellectual puzzle. There's so much to discover!

— Barbara Fredrickson