Secret operations are essential in war; upon them the army relies to make its every move.
If a battle can not be won do not fight it.
Quickness is the essence of the war.
The clever combatant looks to the effect of combined energy, and does not require too much from individuals. Hence his ability to pick out the right men and utilize combined energy
The nature of war is constant change.
It is only one who is thoroughly acquainted with the evils of war that can thoroughly understand the profitable way of carrying it on.