All men can see these tactics whereby I conquer, but what none can see is the strategy out of which victory is evolved.
If you know yourself but not the enemy, for every victory gained you will also suffer a defeat.
The greatest victory is that which requires no battle.
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.