He whose ranks are united in purpose will be victorious.

Spies cannot be usefully employed without a certain intuitive sagacity; They cannot be properly managed without benevolence and straightforwardness; Without subtle ingenuity of mind, one cannot make certain of the truth of their reports; Be subtle! be subtle! and use your spies for every kind of warfare; If a secret piece of news is divulged by a spy before the time is ripe, he must be put to death together with the man to whom the secret was told.

When the leader is morally weak and his discipline not strict, when his instructions and guidance are not enlightened, when there are no consistent rules, neighboring rulers will take advantage of this.

Spies cannot be usefully employed without a certain intuitive sagacity.

It is the business of a general to be quiet and thus ensure secrecy; upright and just, and thus maintain order.

The quality of decision is like the well-timed swoop of a falcon which enables it to strike and destroy its victim.

It is the rule in war, if our forces are ten to the enemy's one, to surround him; if five to one, to attack him; if twice as numerous, to divide our army into two.