To look at a tree is doing, but to see a tree is not-doing.
The most difficult aspect of the Warrior's Path is to learn that the world is pure feeling. Not-doing is the ability to feel the world. Feeling the world means to perceive it through the tensions within the web of life. Average man perceives the world in the way he does because he cares whether something is true or false. But to the warrior it does not matter whether something is true or false.
Average man behaves in a certain way when he is dealing with what he knows to be true, and he behaves in a different way when dealing with what he knows to be untrue. If something is deemed to be true, average man acts upon it with confidence and he believes in what he does. If something is deemed to be untrue, either he doesn't act upon it, or he doesn't believe in what he does.
The warrior, on the other hand, acts in both instances. If something is deemed to be true, he acts in order to do doing. If something is deemed to be untrue, he acts in order to do not-doing.
A warrior does not need to believe something to be true or false, for as long he believes without believing he is not-doing.
Not-doing what is for one the known is the secret in hunting for power.