The opportunity of defeating the enemy is provided by the enemy himself.

O divine art of subtlety and secrecy!

Order or disorder depends on organisation and direction; courage or cowardice on circumstances; strength or weakness on tactical dispositions.

Ground which can be abandoned but is hard to re-occupy is called entangling.

If the enemy leaves a door open, you must rush in.

Therefore I say: know the enemy and know yourself; in a hundred battles you will never be in peril. When you are ignorant of the enemy but know yourself, your chances of winning or losing are equal. If ignorant both of your enemy and of yourself, you are certain in every battle to be in peril.

One who sets the entire army in motion to chase an advantage will not attain it.