Authority has every reason to fear the skeptic, for authority can rarely survive in the face of doubt.
- Vita Sackville-West
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People may doubt what you say, but they will believe what you do. - Lewis Cass
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Who never doubted, never half believed. Where doubt is, there truth is—it is her shadow. - Philip James Bailey
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Laugh at yourself, but don't ever aim your doubt at yourself. Be bold. When you embark for strange places, don't leave any of yourself safely on shore. Have the nerve to go into unexplored territory. - Alan Alda