Tae-kwon-do

I read the following text from the t-shirt of the person sitting on front of me in the class.

All warfare is based on the art of deception.
Hence when able to attack, we must seem unable.
When being our forces, we must seem inactive.
When near, we must seem far.
When far, we must seem near.
Hold bits to entice the enemy.

Feign and crush him!