If I am able to determine the enemy's dispositions while at the same time I conceal my own, then I can concentrate and he must divide.

The general that hearkens to my counsel and acts upon it, will conquer: let such a one be retained in command! The general that hearkens not to my counsel nor acts upon it, will suffer defeat: - let such a one be dismissed!

Probe him and learn where his strength is abundant and where deficient.

He will win who, prepared himself, waits to take the enemy unprepared.

When you are ignorant of the enemy but know yourself, your chances of winning or losing are equal.

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.

Weigh the situation, then move.