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by DanBC 4609 days ago
It is said that if you know your enemies and know yourself, you will not be imperiled in a hundred battles; if you do not know your enemies but do know yourself, you will win one and lose one; if you do not know your enemies nor yourself, you will be imperiled in every single battle. -- widely attributed to Sun Tzu

https://en.wikiquote.org/wiki/Sun_Tzu#Ch._3