
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 [Sun Zi] (c.544? - c.496?B.C.): The Art of War "Attack by Stratagem" (trans. by Lionel Giles (1875 - 1958))
/ Know yourself as well as your enemy.