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Quotation from The Canon of Medicine, Book I by Ibn Sina (Avicenna)
“For just as bad habits of thought supervene on intemperament of the body, so also a physical intemperament may be traced to habits of mind which are contrary to the ideal.”
The Canon of Medicine, Book I, Part 3, Thesis 1, para. 733, trans. O. Cameron Gruner (1930)

The regimen of childhood: guarding children from anger, fear, despondency and sleeplessness forms good habits and also protects the body.
Citation: "For just as bad habits of thought supervene on intemperament of the body, so also a physical intemperament may be traced to habits of mind which are contrary to the ideal." — Ibn Sina (Avicenna), The Canon of Medicine, Book I, Part 3, Thesis 1, para. 733, trans. O. Cameron Gruner (1930). (id avicenna-canon-of-medicine-book-i-q4)
Portrait: Avicenne., Unknown engraver, CC0.
