Under Heaven all can see beauty as beauty, only because there is ugliness.
All can know good as good, only because there is evil.
Being and non-being produce each other.
The difficult is born in the easy. Long is defined by short; the high by the low.
Before and after go along with each other.
So, the sage lives openly with apparent duality and paradoxical unity.
The sage can act without effort, and teach without words.
Nurturing things without possessing them, he works but not for reward. He competes, but not for result.
When the work is done, it is forgotten. This is why it lasts forever.
~Laozi, Tao te Ching, Ch. 2 (Wayne Dyer Translation)