Concentrate your energy and hoard your strength.
When the thunderclap comes, there is no time to cover the ears.
Who can determine where one ends and the other begins?
To know your Enemy, you must become your Enemy.
To perceive victory when it is known to all is not really skilful... It does not take much strength to lift a hair, it does not take sharp eyes to see the sun and moon, it does not take sharp ears to hear the thunderclap.
Plan for what is difficult while it is easy, do what is great while it is small.