The skillful employer of men will employ the wise man, the brave man, the covetous man, and the stupid man.
If we know that our own men are in a condition to attack, but are unaware that the enemy is not open to attack, we have gone only halfway towards victory.
Hence the saying: If you know the enemy and you know yourself your victory will not stand in doubt, if you now Heaven and you know Earth you may make your victory complete.
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The beginning of wisdom, as they say. When you're seventeen you know everything. When you're twenty-seven, if you still know everything, you're still seventeen.