Vinnie DeAngelo

“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, The Art of War

“Rouse him, and learn the principle of his activity or inactivity. Force him to reveal himself, so as to find out his vulnerable spots.”
― Sun Tzu, The Art of War

“Thus we may know that there are five essentials for victory:
1 He will win who knows when to fight and when not to fight.
2 He will win who knows how to handle both superior and inferior forces.
3 He will win whose army is animated by the same spirit throughout all its ranks.
4 He will win who, prepared himself, waits to take the enemy unprepared.
5 He will win who has military capacity and is not interfered with by the sovereign.”
― Sun Tzu, The Art of War

“To know your Enemy, you must become your Enemy.”
― Sun Tzu