“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.”
Turkish Wikipedia
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Attila 22
King of the Hunnic Empire 406–453Related quotes

“Better make a weak man your enemy than your friend.”
Affurisms. From Josh Billings: His Sayings (1865)

“Flee an enemy who knows your weakness.”
Fuyez un ennemi qui sait votre défaut.
Néarque, act I, scene i.
Polyeucte (1642)

This Business of Living (1935-1950)

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

“Be of one mind and one faith, that you may conquer your enemies and lead long and happy lives.”
As quoted in The Mongol Empire : Its Rise and Legacy (1940) by Michael Prawdin, p. 224
Source: The Goblin Quest Series, Goblin Hero (2007), Chapter 7 (p. 117)

1990s, Long Walk to Freedom (1995)