The Book in Three Sentences
Know when to fight and when not to fight: avoid what is strong and strike at what is weak. Know how to deceive the enemy: appear weak when you are strong, and strong when you are weak. Know your strengths and weaknesses: if you know the enemy and know yourself, you need not fear the result of a hundred battles.
Know when to fight and when not to fight: avoid what is strong and strike at what is weak. Know how to deceive the enemy: appear weak when you are strong, and strong when you are weak. Know your strengths and weaknesses: if you know the enemy and know yourself, you need not fear the result of a hundred battles.