Zhījǐ, zhī bǐ; bǎi zhàn bù dài.

知己知彼, 百戰不殆。

Lit [If you] know [your]self [and] know them, [in one] hundred battles [you'll] not [be in] danger.

Fig If you know your opposition and know yourself, you'll never be defeated.

Note [This is the original in Sūnzǐ Bīngfǎ: Móu Gōng and in R3K, chap. 5 of the preceding entry; note: bǎizhàn-bùdài is used as an idiom meaning “to win battle after battle”; see also the preceding entry.]

Topics Bīngfǎ CONFLICT ENEMIES FIGHTING Móu Gāng R3K SELF-KNOWLEDGE STRATEGY SUCCESS Sūnzǐ UNDERSTANDING