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Quotation from Theaetetus by Plato
“How can you determine whether at this moment we are sleeping, and all our thoughts are a dream; or whether we are awake, and talking to one another in the waking state”
Theaetetus, Perception and its objections, c. 158b-c, trans. Benjamin Jowett (1892)
Socrates raises the dream objection to the claim that every perception is true.
Citation: "How can you determine whether at this moment we are sleeping, and all our thoughts are a dream; or whether we are awake, and talking to one another in the waking state" — Plato, Theaetetus, Perception and its objections, c. 158b-c, trans. Benjamin Jowett (1892). (id plato-theaetetus-q4)
