“They said it was better to know your enemy, but how did it help to know that your enemy’s one weakness was your weakness too”

— Cassandra Clare , book City of Heavenly Fire

Source: City of Heavenly Fire

Last update June 3, 2021. History

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Cassandra Clare 2041

American author 1973

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“Flee an enemy who knows your weakness.”

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Fuyez un ennemi qui sait votre défaut.
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“Better make a weak man your enemy than your friend.”

Josh Billings (1818–1885) American humorist

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“Use your enemy's weaknesses to your advantage. On the other hand, if your enemy is too strong, retreat and act again on the day you conquer it.”

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Turkish Wikipedia
https://quotestats.com/topic/attila-hun-quotes/

“It is said that if you know your enemies and know yourself, you will not be imperiled in a hundred battles; if you do not know your enemies but do know yourself, you will win one and lose one; if you do not know your enemies nor yourself, you will be imperiled in every single battle.”

Sun Tzu (-543–-495 BC) ancient Chinese military general, strategist and philosopher from the Zhou Dynasty

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

“How do I know I can trust you?'

'You can't,' he said bluntly. 'You've got to take it on faith that the enemy of your enemy is your friend.”

Richelle Mead book Last Sacrifice

Source: Last Sacrifice

“To know your Enemy, you must become your Enemy.”

Sun Tzu (-543–-495 BC) ancient Chinese military general, strategist and philosopher from the Zhou Dynasty

This is sometimes attributed to Sun Tzu in combination with the above quote, as well as alone, but it too has not been sourced to any published translation of The Art of War, though it is similar in concept to his famous statement in Ch. 3 : "It is said that if you know your enemies and know yourself, you will not be imperiled in a hundred battles..."
Misattributed