The hardest thing in the world to understand is the income tax.

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About this quote

This line turns simplicity into a test of understanding. It is useful for leaders, teachers, builders, and anyone trying to make a complicated decision easier to act on.

When to use it

  • Use it when editing a strategy, presentation, or product idea down to the few parts that truly matter.
  • Keep it near planning work as a reminder that strong thinking often sounds plain after the hard work is done.
  • Return to it when a difficult idea needs to be explained without losing its truth.