Know the enemy and know yourself.
All wars are won or lost before they are ever fought.
He who relies solely on warlike measures shall be exterminated; he who relies solely on peaceful measures shall perish.
It is more important to outhink your enemy, than to outfight him
In all fighting, the direct method may be used for joining battle, but indirect methods will be needed in order to secure victory.
He will win who has military capacity and is not interfered with by the sovereign.