He will win who, prepared himself, waits to take the enemy unprepared. He will win who has military capacity and is not interfered with by the sovereign. Put yourself beyond the possibility of defeat. The opportunity is provided by the enemy. One may know how to conquer without being able to do it.
Security implies defensive tactics.
Victory means offensive tactics. Defense - Hide in the most secret recesses. Attack from the topmost heights. To see victory when all can is not excellence. Victories must bring neither reputation for wisdom nor credit for courage.