Ever desireless, one can see the mystery. Ever desiring, one can see the manifestations. These two spring from the same source but differ in name; this appears as darkness. Darkness within darkness. The gate to all mystery.
Every being in the universe is an expression of the Tao. It springs into existence, unconscious, perfect, free, takes on a physical body, lets circumstances complete it. That is why every being spontaneously honors the Tao. The Tao gives birth to all beings, nourishes them, maintains them, cares for them, comforts them, protects them, takes them back to itself, creating without possessing, acting without expecting, guiding without interfering. That is why love of the Tao is in the very nature of things.
Under heaven all can see beauty as beauty only because there is ugliness. All can know good as good only because there is evil. Therefore having and not having arise together. Difficult and easy complement each other. Long and short contrast each other. High and low rest upon each other. Voice and sound harmonize each other. Front and back follow one another.
The generals have a saying: "Rather than make the first move it is better to wait and see. Rather than advance an inch it is better to retreat a yard." This is called going forward without advancing, pushing back without using weapons. There is no greater misfortune than underestimating your enemy. Underestimating your enemy means thinking that he is evil. Thus you destroy your three treasures and become an enemy yourself. When two great forces oppose each other, the victory will go to the one that knows how to yield.