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Quotation from Summa Theologica by Thomas Aquinas
“so that sometimes while asleep a man may judge that what he sees is a dream, discerning, as it were, between things, and their images”
Summa Theologica, I, Q. 84, Art. 8, Reply Obj. 2, trans. Fathers of the English Dominican Province (1911-1920)
Aquinas describes what is now called lucid dreaming, when the common sense is partly freed toward the end of sleep.
Citation: "so that sometimes while asleep a man may judge that what he sees is a dream, discerning, as it were, between things, and their images" — Thomas Aquinas, Summa Theologica, I, Q. 84, Art. 8, Reply Obj. 2, trans. Fathers of the English Dominican Province (1911-1920). (id summa-theologica-q9)
Portrait: Saint Thomas Aquinas, Carlo Crivelli, Public domain.
