Sun Tzu disse mesmo «Know your enemy and know yourself»?

Sun Tzu disse mesmo «Know your enemy and know yourself»?

Encontrado com diferenças. Encontrado quase palavra por palavra em obras atribuídas a Sun Tzu. Compara com o original abaixo.

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 · fonte

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 · fonte

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 · fonte

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