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About this quote

What does it mean?
Ideas are temporary and should be updated.
In plain terms
Do not treat ideas as permanent.
What can you take from it?
Update your mental models regularly.

Where it applies

  • research
  • decision making

Putting it to work

  • review assumptions
  • seek new data

Questions to consider

  • What belief might need updating?

Another view

Some ideas remain useful for long periods.

More from Marshall McLuhan

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  2. The perfection of the means of communication has given [the] average power complex of the human being an enormous extension of expression. (1953)

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  3. First Man made the hammer, then the hammer made the Man.

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