“War: first, one hopes to win; then one expects the enemy to lose; then, one is satisfied that the enemy too is suffering; in the end, one is surprised that everyone has lost.”
Die Fackel no. 46 (9 October 1917)
Die Fackel
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Karl Kraus 94
Czech playwright and publicist 1874–1936Related quotes

Variant translations
If you know others and know yourself, you will not be imperiled in a hundred battles; if you do not know others but know yourself, you win one and lose one; if you do not know others and do not know yourself, you will be imperiled in every single battle.
Know your enemy and know yourself, find naught in fear for 100 battles. Know yourself but not your enemy, find level of loss and victory. Know not thy enemy nor yourself, wallow in defeat every time.
Literal translation: Know [the] other, know [the] self, hundred battles without danger; not knowing [the] other but know [the] self, one win one loss; not knowing [the] other, not knowing [the] self, every battle must [be] lost.
Source: The Art of War, Chapter III · Strategic Attack

“One should attend to one's enemies, for they are the first persons to detect one's errors.”
§ 5
From Lives and Opinions of the Eminent Philosophers by Diogenes Laërtius

Jacula Prudentum (1651)

Jasper Ridley, Tito: A Biography (Constable and Company Ltd., 1994), p. 323.
Other

Variant translations
Hence to fight and conquer in all your battles is not supreme excellence; supreme excellence consists in breaking the enemy's resistance without fighting.
The best victory is when the opponent surrenders of its own accord before there are any actual hostilities... It is best to win without fighting.
Source: The Art of War, Chapter III · Strategic Attack

To Leon Goldensohn, February 4, 1946, from "The Nuremberg Interviews" by Leon Goldensohn, Robert Gellately - History - 2004.