‘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’.  We ask ourselves, Who am I to be brilliant, gorgeous, talented, fabulous? Actually, who are you not to be…?  Your playing small doesn’t serve the world.  There’s nothing enlightened about shrinking so that other people won’t feel insecure around you…. And, as we let our own light shine, we unconsciously give other people permission to do the same (1992 pp.190-191).

Marianne Williamson

From A Return to Love: Reflections on the Principles of a Course in Miracles.  London: HarperCollins, 1992.
(Usually attributed to Nelson Mandela who quoted this passage).