Common sense is the collection of prejudices acquired by age eighteen.

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About this quote

If what feels obvious is merely inherited, stop treating handed-down habits like facts. Ask where beliefs came from, test them honestly, and be willing to discard the ones that hold you back. Progress comes from replacing comfortable assumptions with verified choices and steady action.

When to use it

  • Before blaming a colleague for a missed deadline, ask which assumptions about their work you accepted without proof and check the facts.
  • When you catch yourself repeating a family belief about money or success, test it by trying one small different behavior for a month.
  • Use the line to push a team: stop defending 'how we've always done it' and run a quick experiment to see if a new way works better.
  • If a personal fear feels unquestionable, write down when you first heard it, challenge its source, and take one concrete step to prove or disprove it.