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About this quote

What does it mean?
There is no clear way to distinguish waking life from dreams.
In plain terms
It is hard to know if we are awake or dreaming.
What can you take from it?
Question the certainty of your perceptions.

Where it applies

  • metaphysics
  • introspection

Putting it to work

  • doubt your senses

Questions to consider

  • How do you know you are awake?

Another view

Practical life often requires accepting some reality.

More from Rene Descartes

  1. Traveling is almost like talking with those of other centuries.

    Permalink to quote #42
  2. When it is not in our power to determine what is true, we ought to follow what is most probable.

    Permalink to quote #44
  3. To know what people really think, pay regard to what they do, rather than what they say.

    Permalink to quote #41

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