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But I cannot forget that, at other times I have been deceived in sleep by similar illusions; and, attentively considering those cases, I perceive so clearly that there exist no certain marks by which the state of waking can ever be distinguished from sleep, that I feel greatly astonished; and in amazement I almost persuade myself that I am now dreaming.
Rene Descartes
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Interpretation

What this quote means

The quote reflects on the ambiguity between dreaming and reality, suggesting that perception can be deceiving.

In this quote, René Descartes expresses his astonishment at the indistinguishability between dreams and reality. He reflects on past experiences where he could not determine whether he was awake or dreaming, leading him to question the certainty of his perceptions. This philosophical inquiry into the nature of existence highlights the complexities of knowledge and belief, pushing us to consider the validity of our sensory experiences.

Themes

DreamRealityPerceptionIllusionPhilosophy

In practice

Example use cases

During a philosophy class discussing the nature of reality and consciousness.

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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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