Beauty is seen only because of ugliness
Greatness is known only for its lack

Emptiness and fullness are born of each other
Difficulty and ease create one another

Long and short grow out of each other
High and low reflect one another

Sound and listening complement each other
Front and back follow one another

And on it goes…

Thus the wise pay no heed
Their acts without words showing the way

So do all things flow without thought

Creating without possessing
Acting without attachment
Achieving without claiming achievement
Existing without laying claim to existence

Thus moves all life unto eternity

Tao Te Ching
The Way of the Wise
Chapter Two