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Quotation from On War by Carl von Clausewitz
“By this comes to light for the inexperienced eye one of those things which put fetters in the dark, as it were, on the action of the mind, and wear out in secret the powers of the soul”
On War, Book I, Ch. 5, Of Bodily Exertion in War, trans. J. J. Graham (1873), rev. F. N. Maude (1908)

Clausewitz on fatigue as a hidden drain on judgment and morale.
Citation: "By this comes to light for the inexperienced eye one of those things which put fetters in the dark, as it were, on the action of the mind, and wear out in secret the powers of the soul" — Carl von Clausewitz, On War, Book I, Ch. 5, Of Bodily Exertion in War, trans. J. J. Graham (1873), rev. F. N. Maude (1908). (id on-war-q8)
Portrait: Carl von Clausewitz (1780–1831), Wilhelm Wach, Public domain.
