Thus We May Know That There Are Five Essentials

If you know the enemy and know yourself, your victory will not stand in doubt; if you know Heaven and know Earth, you may make your victory complete.

The greatest victory is that which requires no battle.

He will win who knows when to fight and when not to fight

If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.

know yourself and you will win all battles

Success = 1 part work + 1 part play + 1 part keep your mouth shut