Nothing is more difficult than the art of maneuver. What is difficult about maneuver is to make the devious route the most direct and to turn misfortune to advantage.
Every battle is won before it is fought.
Opportunities increase as they are taken.
In desperate position, you must fight.
Rapidity is the essence of war.
To ... not prepare is the greatest of crimes; to be prepared beforehand for any contingency is the greatest of virtues.