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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。(故曰：知彼知己，百战不 殆；不知彼而知己，一胜一负；不知彼，不知己，每战必殆。)
So it is said that if you know your enemies and know yourself, you can win a thousand battles without a single loss.

If you only know yourself, but not your opponent, you may win or may lose.

If you know neither yourself nor your enemy, you will always endanger yourself.