What is the original Chinese?

故曰：知彼知己，百戰不殆；不知彼而知己，一勝一負；不知彼不知己，每戰必殆。. Translated from the original Chinese by Spartan Surfers.

知彼知己，百戰不殆

Know them and know yourself, and a hundred battles hold no danger.

Sun Tzu, The Art of War 3 (Attack by Stratagem)

What it means

Most defeats come from misreading the opponent or, worse, yourself. Honest knowledge of both sides removes the danger. Study the other side and audit your own.

The source

"Know them and know yourself, and a hundred battles hold no danger." Sun Tzu said it in The Art of War 3 (Attack by Stratagem). Translated from the original Chinese by Spartan Surfers.

"故曰：知彼知己，百戰不殆；不知彼而知己，一勝一負；不知彼不知己，每戰必殆。"

Original Chinese, The Art of War 3 (Attack by Stratagem). Text read at zh.wikisource.org.

Who said it

Sun Tzu (c. 5th century BC). Chinese general traditionally credited with The Art of War, a short book on strategy that values preparation, deception and winning without battle. It has been read by commanders, athletes and founders ever since.

Questions

What does "Know them and know yourself, and a hundred battles hold no danger." mean?: Most defeats come from misreading the opponent or, worse, yourself. Honest knowledge of both sides removes the danger. Study the other side and audit your own.
Who said "Know them and know yourself, and a hundred battles hold no danger."?: Sun Tzu (c. 5th century BC). Source: The Art of War 3 (Attack by Stratagem).
What is the original Chinese?: 故曰：知彼知己，百戰不殆；不知彼而知己，一勝一負；不知彼不知己，每戰必殆。. Translated from the original Chinese by Spartan Surfers.
Is "Know them and know yourself, and a hundred battles hold no danger." on a shirt?: Yes. We print it to order on our tees in 7 illustrated looks, from $44, with free US shipping.

Cite this line

"Know them and know yourself, and a hundred battles hold no danger." (Sun Tzu, The Art of War 3 (Attack by Stratagem), translated by Spartan Surfers). https://spartansurfers.com/quotes/know-them-and-know-yourself-and-a-hundred