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The quote "Our deepest fear is not that we are inadequate. Our deepest fear is that we are powerful beyond measure. It is our light, not our darkness that most frightens us." is from the movie "Fearless" by Marianne Williamson.

While it's often attributed to Nelson Mandela, it was actually written by Williamson and included in her book "A Return to Love: Reflections on the Principles of a Course in Miracles." It gained popularity after Mandela used it in a speech.