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.
Sun Tzu's The Art of War may have started life as a Chinese military treatise, but its influence around the globe has seeped into every facet of our lives. Referenced in pop culture, and used to bolster success in business strategies, politics, football tournaments, and more, this ancient tome is a vital tool for anyone who wants to win.