Know the enemy, know yourself and victory is never in doubt, not in a hundred battles. - Sun Tzu

(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. 18. Hence the saying: 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.

If you wish to feign confusion in order to lure the enemy on, you must first have perfect discipline; if you wish to display timidity in order to entrap the enemy, you must have extreme courage; if you wish to parade your weakness in order to make the enemy over-confident, you must have exceeding strength.”] 18. Hiding order beneath the cloak of disorder is simply a question of subdivision; [See supra, ss. 1.] concealing courage under a show of timidity presupposes a fund of latent energy; [The commentators strongly understand a certain Chinese word here differently than anywhere else in this chapter. Thus Tu Mu says: “seeing that we are favorably circumstanced and yet make no move, the enemy will believe that we are really afraid.”] masking strength with weakness is to be effected by tactical dispositions.

微乎微乎，至於無形；神乎神乎，至於無聲；故能為敵之司命。