Правда ли Sun Tzu сказал «Know your enemy and know yourself»?

Правда ли Sun Tzu сказал «Know your enemy and know yourself»?

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31. Hence the saying: If you know the enemy and know yourself, your victory will not stand in doubt; if you know Heaven and know Earth, you may make your victory complete.
The Art of War — Sun Tzu, ¶706 · Public domain (US), Project Gutenberg #132 · источник

18. Hence the saying: If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat.
The Art of War — Sun Tzu, ¶287 · Public domain (US), Project Gutenberg #132 · источник

31. Hence the saying: If you know the enemy and know yourself, your victory will not stand in doubt; if you know Heaven and know Earth, you may make your victory complete.
The Art of War — Sun Tzu, ¶278 · Public domain (US), Project Gutenberg #17405 · источник

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