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When I consider this carefully, I find not a single property which with certainty separates the waking state from the dream. How can you be certain that your whole life is not a dream?
Rene Descartes
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Interpretation

What this quote means

The quote questions the distinction between reality and dreams, suggesting that our perception may be uncertain.

In this quote, René Descartes reflects on the ambiguity of distinguishing between waking life and dreams. He challenges the assumption that we can definitively know when we are awake versus dreaming, suggesting that our experiences may be equally surreal and uncertain. This philosophical inquiry raises deeper questions about the nature of reality and the reliability of our perceptions.

Themes

RealityDreamsPerceptionPhilosophyExistence

In practice

Example use cases

In a philosophy class discussing the nature of reality and dreams.

More from Rene Descartes

The reading of all good books is like a conversation with the finest minds of past centuries.
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If we possessed a thorough knowledge of all the parts of the seed of any animal (e.g. man), we could from that alone, be reasons entirely mathematical and certain, deduce the whole conformation and figure of each of its members, and, conversely if we knew several peculiarities of this conformation, we would from those deduce the nature of its seed.
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Mathematics is a more powerful instrument of knowledge than any other that has been bequeathed to us by human agency.
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Before examining this more carefully and investigating its consequences, I want to dwell for a moment in the contemplation of God, to ponder His attributes in me, to see, admire, and adore the beauty of His boundless light, insofar as my clouded insight allows. Believing that the supreme happiness of the other life consists wholly of the contemplation of divine greatness, I now find that through less perfect contemplation of the same sort I can gain the greatest joy available in this life.
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I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.
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The greatest minds are capable of the greatest vices as well as of the greatest virtues.
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