Passage 3-13
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.
Therefore: - Know the enemy and know yourself—in a hundred battles, never be imperiled - Know yourself but not the enemy—win one, lose one - Know neither the enemy nor yourself—every battle brings certain peril
Know the enemy and know yourself (知彼知己, 百戰不殆) — the most recognized passage in Sun Tzu. Intelligence as the foundation of all strategic confidence.
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These passages from other chapters connect to the themes in Passage 3-13:
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