Chapter 16, Part 1A - Chuang Tzu

Those who set about mending the inborn nature through vulgar learning, hoping thereby to return once more to the Beginning; those who set about muddling their desires through vulgar ways of thought, hoping thereby to attain clarity - they may be called the blind and benighted people.

The men of ancient times who practiced the Way employed tranquility to cultivate knowledge. Knowledge lived in them, yet they did nothing for its sake. So they may be said to have employed knowledge to cultivate tranquility. Knowledge and tranquility took turns cultivating each other, and harmony and order emerged from the inborn nature.
~ Burton Watson translation via Terebess Asia Online ~

Go here to read the introductory post to the chapters of the Book of Chuang Tzu.