¿De verdad dijo Sun Tzu «Know your enemy and know yourself»?

¿De verdad dijo Sun Tzu «Know your enemy and know yourself»?

Encontrado con diferencias. Encontrado casi palabra por palabra en obras atribuidas a Sun Tzu. Compáralo con el original abajo.

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 · fuente

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 · fuente

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 · fuente

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