Keep your friends close and your enemies even closer.
One who has few must prepare against the enemy; one who has many makes the enemy prepare against him.
Those who do not know the plans of competitors cannot prepare alliances. Those who do not know the lay of the land cannot maneuver their forces. Those who do not use local guides cannot take advantage of the ground.
Rapidity is the essence of war.
The King is only fond of words, and cannot translate them into deeds.
Convince your enemy that he will gain very little by attacking you; this will diminish his enthusiasm