Invincibility is in oneself, and vulnerability is in the opponent. Invincibility is a matter of defense, vulnerability is a matter of attack. Therefore skillful warriors are able to be invincible, but they cannot cause opponents to be vulnerable. That is why it is said that victory is discerned and not manufactured.

The skillful leader subdues the enemy's troops without any fighting.

Knowledge of the enemy's dispositions can only be obtained from other men.

Perfection in war lies in so sapping your opponents will that he surrenders without fighting.

To ... not prepare is the greatest of crimes; to be prepared beforehand for any contingency is the greatest of virtues.

Know thy enemy and know thy self and you will win a hundred battles.

Rapidity is the essence of war: take advantage of the enemy's unreadiness, make your way by unexpected routes, and attack unguarded spots.