Quickness is the essence of the war.
Maneuvering with an army is advantageous; with an undisciplined multitude, most dangerous.
It is the business of a general to be serene and inscrutable, impartial and self-controlled.
Being unconquerable lies with yourself; being conquerable lies with your enemy.
Of all those in the army close to the commander none is more intimate than the secret agent; of all rewards none more liberal than those given to secret agents; of all matters none is more confidential than those relating to secret operations.
In desperate position, you must fight.