Sun Tzu: Enemy

“Keep your friends close, and your enemies closer.”

Sun Tzu

This has often been attributed to Sun Tzu and sometimes to Petrarch. It comes most directly from a line spoken by Michael Corleone in The Godfather Part II (1974), written by Mario Puzo and Francis Ford Coppola:
My father taught me many things here. He taught me in this room. He taught me: keep your friends close but your enemies closer.
Niccolò Machiavelli, who is also sometimes credited, wrote on the subject in The Prince:
It is easier for the prince to make friends of those men who were contented under the former government, and are therefore his enemies, than of those who, being discontented with it, were favourable to him and encouraged him to seize it.
Misattributed

Christmas

“Fear is the true enemy, the only enemy.”

Sun Tzu

Attributed implicitly to Sun Tzu by "William Riker" in the episode The Last Outpost of the TV program Star Trek: The Next Generation, but no source for this quote predates the episode's airing in 1987.
Misattributed

Fear

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

Sun Tzu

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

“To a surrounded enemy, you must leave a way of escape.”

Sun Tzu

Source: The Art of War, Chapter VII · Military Maneuvers

Way

“It is the rule in war, if ten times the enemy's strength, surround them; if five times, attack them; if double, be able to divide them; if equal, engage them; if fewer, defend against them; if weaker, be able to avoid them.”

Sun Tzu

Source: The Art of War, Chapter III · Strategic Attack

War , Time

“The supreme art of war is to subdue the enemy without fighting.”

Sun Tzu

Fight , War , Art

“Sunzi said: The good fighters of old first put themselves beyond the possibility of defeat, and then waited for an opportunity of defeating the enemy. To secure ourselves against defeat lies in our own hands, but the opportunity of defeating the enemy is provided by the enemy himself. Thus the good fighter is able to secure himself against defeat, but cannot make certain of defeating the enemy.”

Sun Tzu

Translation by Lionel Giles
Source: The Art of War, Chapter IV · Disposition of the Army

Waiting

“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

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

“He who is prudent and lies in wait for an enemy who is not, will be victorious.”

Sun Tzu

Source: The Art of War, Chapter III · Strategic Attack

Waiting , Victory

“In the practical art of war, the best thing of all is to take the enemy's country whole and intact; to shatter and destroy it is not so good. So, too, it is better to recapture an army entire than to destroy it, to capture a regiment, a detachment or a company entire than to destroy them.”

Sun Tzu

Variant translations
It is best to keep one’s own state intact; to crush the enemy’s state is only second best.
Source: The Art of War, Chapter III · Strategic Attack

War , Art , Country

“The art of war teaches us to rely not on the likelihood of the enemy's not coming, but on our own readiness to receive him; not on the chance of his not attacking, but rather on the fact that we have made our position unassailable.”

Sun Tzu

Source: The Art of War, Chapter VIII · Variations and Adaptability

War , Art , Chance

“For to win one hundred victories in one hundred battles is not the acme of skill. To subdue the enemy without fighting is the acme of skill.”

Sun Tzu

Variant translations
Hence to fight and conquer in all your battles is not supreme excellence; supreme excellence consists in breaking the enemy's resistance without fighting.
The best victory is when the opponent surrenders of its own accord before there are any actual hostilities... It is best to win without fighting.
Source: The Art of War, Chapter III · Strategic Attack

Victory , Fight

“All warfare is based on deception. Hence, when we are able to attack, we must seem unable; when using our forces, we must appear inactive; when we are near, we must make the enemy believe we are far away; when far away, we must make him believe we are near.”

Sun Tzu

Variant translations
A military operation involves deception. Even though you are competent, appear to be incompetent. Though effective, appear to be ineffective.
Source: The Art of War, Chapter I · Detail Assessment and Planning

Appearance

“Thus, what is of supreme importance in war is to attack the enemy's strategy.”

Sun Tzu book The Art of War

是故上攻伐谋
The Art of War, Chapter III · Strategic Attack
Variant: Thus, what is of supreme importance in war is to attack the enemy's strategy.

War

“And therefore those skilled in war bring the enemy to the field of battle and are not brought there by him.”

Sun Tzu

Source: The Art of War, Chapter VI · Weaknesses and Strengths

War

“Hold out baits to entice the enemy. Feign disorder, and crush him.”

Sun Tzu

Source: The Art of War, Chapter I · Detail Assessment and Planning

“If your enemy is secure at all points, be prepared for him. If he is in superior strength, evade him. If your opponent is temperamental, seek to irritate him. Pretend to be weak, that he may grow arrogant. If he is taking his ease, give him no rest. If his forces are united, separate them. Attack him where he is unprepared, appear where you are not expected.”

Sun Tzu

"If his forces are united, separate them" is also interpreted: "If sovereign and subject are in accord, put division between them."
Source: The Art of War, Chapter I · Detail Assessment and Planning

Appearance

“Speed is the essence of war. Take advantage of the enemy's unpreparedness; travel by unexpected routes and strike him where he has taken no precautions.”

Sun Tzu

Source: The Art of War, Chapter XI · The Nine Battlegrounds

War , Travel , Speed

“Now the reason the enlightened prince and the wise general conquer the enemy whenever they move and their achievements surpass those of ordinary men is foreknowledge.”

Sun Tzu

Source: The Art of War, Chapter XIII · Intelligence and Espionage

Men

“It is essential to seek out enemy agents who have come to conduct espionage against you and to bribe them to serve you. Give them instructions and care for them. Thus doubled agents are recruited and used.”

Sun Tzu

Source: The Art of War, Chapter XIII · Intelligence and Espionage