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

A leader leads by example not by force.

Hence the saying: The enlightened ruler lays his plans well ahead; the good general cultivates his resources.

Without harmony in the State, no military expedition can be undertaken; without harmony in the army, no battle array can be formed.

Hence the saying: If you know the enemy and you know yourself, your victory will not stand in doubt; if you now Heaven and you know Earth, you may make your victory complete.

Management of many is the same as management of few. It is a matter of organization.

It is said that if you know your enemies and know yourself, you will not be imperiled in a hundred battles; if you do not know your enemies but do know yourself, you will win one and lose one; if you do not know your enemies nor yourself, you will be imperiled in every single battle.