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Quotation from Summa Theologica by Thomas Aquinas
“Indeed, the commotion of the spirits and humors may be so great that such appearances may even occur to those who are awake, as is seen in mad people, and the like”
Summa Theologica, I, Q. 111, Art. 3, trans. Fathers of the English Dominican Province (1911-1920)

Explaining how an angel could move the imagination, Aquinas first gives a natural account of hallucination through disturbed humours and spirits.
Citation: "Indeed, the commotion of the spirits and humors may be so great that such appearances may even occur to those who are awake, as is seen in mad people, and the like" — Thomas Aquinas, Summa Theologica, I, Q. 111, Art. 3, trans. Fathers of the English Dominican Province (1911-1920). (id summa-theologica-q11)
Portrait: Saint Thomas Aquinas, Carlo Crivelli, Public domain.
